Linux Mint Updating

misha.physics

misha.physics

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Could anyone help me to update my "Linux Mint 20.3 Cinnamon" to a current version (if it's possible at all)? My distribution's support ended over 100 days ago. I tried commands:
Code: 
sudo apt update
sudo apt upgrade -y
sudo apt install mintupgrade
sudo mintupgrade
But I get the error:

Screenshot from 2025-09-17 19-02-10.png

Also, I get the LOG:
Code: 
Running check 'Phase 1: Preparation'
=================
APT Repositories:
=================
Repos:
  No active apt repos in: /etc/apt/sources.list
  Active apt repos in: /etc/apt/sources.list.d/google-chrome.list
  1: deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
  1: deb http://packages.linuxmint.com una main upstream import backport #id:linuxmint_main
  2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
  3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
  4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
  5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
  6: deb http://archive.canonical.com/ubuntu/ focal partner
  Active apt repos in: /etc/apt/sources.list.d/skype-stable.list
  1: deb [arch=amd64] https://repo.skype.com/deb stable main
=================

Running check 'Linux Mint version'
Check succeeded:  Linux Mint version

Running check 'Power source'
Check succeeded:  Power source

Running check 'APT cache'
rm -rf /var/lib/apt/lists/*
DEBIAN_PRIORITY=critical apt-get update
Get:1 http://dl.google.com/linux/chrome/deb stable InRelease [1 825 B]
Get:2 http://archive.canonical.com/ubuntu focal InRelease [12,2 kB]
Err:3 https://repo.skype.com/deb stable InRelease
  503  Service Unavailable [IP: 104.81.110.232 443]
Get:4 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [128 kB]
Ign:6 http://packages.linuxmint.com una InRelease
Get:7 http://packages.linuxmint.com una Release [24,1 kB]
Get:8 http://dl.google.com/linux/chrome/deb stable/main amd64 Packages [1 208 B]
Get:9 http://packages.linuxmint.com una Release.gpg [833 B]
Get:10 http://archive.ubuntu.com/ubuntu focal-updates InRelease [128 kB]
Get:11 http://archive.ubuntu.com/ubuntu focal-backports InRelease [128 kB]
Get:12 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [3 564 kB]
Get:13 http://archive.ubuntu.com/ubuntu focal/main i386 Packages [718 kB]
Get:14 http://packages.linuxmint.com una/main i386 Packages [15,6 kB]
Get:15 http://packages.linuxmint.com una/main amd64 Packages [16,2 kB]
Get:16 http://packages.linuxmint.com una/upstream i386 Packages [13,5 kB]
Get:17 http://packages.linuxmint.com una/upstream amd64 Packages [50,4 kB]
Get:18 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [970 kB]
Get:19 http://archive.ubuntu.com/ubuntu focal/main Translation-en [506 kB]
Get:20 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages [881 kB]
Get:21 http://archive.ubuntu.com/ubuntu focal/main amd64 DEP-11 Metadata [494 kB]
Get:22 http://packages.linuxmint.com una/import amd64 Packages [7 783 B]
Get:23 http://packages.linuxmint.com una/import i386 Packages [3 273 B]
Get:24 http://packages.linuxmint.com una/backport i386 Packages [27,1 kB]
Get:25 http://packages.linuxmint.com una/backport amd64 Packages [90,3 kB]
Get:26 http://security.ubuntu.com/ubuntu focal-security/main Translation-en [518 kB]
Get:27 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [74,6 kB]
Get:28 http://security.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [14,4 kB]
Get:29 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [3 768 kB]
Get:30 http://archive.ubuntu.com/ubuntu focal/main amd64 c-n-f Metadata [29,5 kB]
Get:31 http://archive.ubuntu.com/ubuntu focal/restricted amd64 Packages [22,0 kB]
Get:32 http://archive.ubuntu.com/ubuntu focal/restricted i386 Packages [8 112 B]
Get:33 http://archive.ubuntu.com/ubuntu focal/restricted Translation-en [6 212 B]
Get:34 http://archive.ubuntu.com/ubuntu focal/restricted amd64 c-n-f Metadata [392 B]
Get:35 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [8 628 kB]
Get:36 http://security.ubuntu.com/ubuntu focal-security/restricted i386 Packages [42,5 kB]
Get:37 http://security.ubuntu.com/ubuntu focal-security/restricted Translation-en [527 kB]
Get:38 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 DEP-11 Metadata [212 B]
Get:39 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 c-n-f Metadata [584 B]
Get:40 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [1 040 kB]
Get:41 http://security.ubuntu.com/ubuntu focal-security/universe i386 Packages [698 kB]
Get:42 http://security.ubuntu.com/ubuntu focal-security/universe Translation-en [221 kB]
Get:43 http://security.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [160 kB]
Get:44 http://security.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [22,4 kB]
Get:45 http://security.ubuntu.com/ubuntu focal-security/multiverse i386 Packages [7 204 B]
Get:46 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [26,6 kB]
Get:47 http://security.ubuntu.com/ubuntu focal-security/multiverse Translation-en [6 448 B]
Get:48 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 DEP-11 Metadata [940 B]
Get:49 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 c-n-f Metadata [604 B]
Get:50 http://archive.ubuntu.com/ubuntu focal/universe i386 Packages [4 642 kB]
Get:51 http://archive.ubuntu.com/ubuntu focal/universe Translation-en [5 124 kB]
Get:52 http://archive.ubuntu.com/ubuntu focal/universe amd64 DEP-11 Metadata [3 603 kB]
Get:53 http://archive.ubuntu.com/ubuntu focal/universe amd64 c-n-f Metadata [265 kB]
Get:54 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages [144 kB]
Get:55 http://archive.ubuntu.com/ubuntu focal/multiverse i386 Packages [74,7 kB]
Get:56 http://archive.ubuntu.com/ubuntu focal/multiverse Translation-en [104 kB]
Get:57 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 DEP-11 Metadata [48,4 kB]
Get:58 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 c-n-f Metadata [9 136 B]
Get:59 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [3 955 kB]
Get:60 http://archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [1 114 kB]
Get:61 http://archive.ubuntu.com/ubuntu focal-updates/main Translation-en [600 kB]
Get:62 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [276 kB]
Get:63 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 c-n-f Metadata [18,0 kB]
Get:64 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [3 922 kB]
Get:65 http://archive.ubuntu.com/ubuntu focal-updates/restricted i386 Packages [44,1 kB]
Get:66 http://archive.ubuntu.com/ubuntu focal-updates/restricted Translation-en [548 kB]
Get:67 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 DEP-11 Metadata [212 B]
Get:68 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 c-n-f Metadata [604 B]
Get:69 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1 262 kB]
Get:70 http://archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [823 kB]
Get:71 http://archive.ubuntu.com/ubuntu focal-updates/universe Translation-en [303 kB]
Get:72 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [446 kB]
Get:73 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [29,3 kB]
Get:74 http://archive.ubuntu.com/ubuntu focal-updates/multiverse i386 Packages [8 440 B]
Get:75 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [29,7 kB]
Get:76 http://archive.ubuntu.com/ubuntu focal-updates/multiverse Translation-en [8 316 B]
Get:77 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [940 B]
Get:78 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 c-n-f Metadata [688 B]
Get:79 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 Packages [45,7 kB]
Get:80 http://archive.ubuntu.com/ubuntu focal-backports/main i386 Packages [36,1 kB]
Get:81 http://archive.ubuntu.com/ubuntu focal-backports/main Translation-en [16,3 kB]
Get:82 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 DEP-11 Metadata [7 996 B]
Get:83 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 c-n-f Metadata [1 420 B]
Get:84 http://archive.ubuntu.com/ubuntu focal-backports/restricted amd64 DEP-11 Metadata [216 B]
Get:85 http://archive.ubuntu.com/ubuntu focal-backports/restricted amd64 c-n-f Metadata [116 B]
Get:86 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages [25,0 kB]
Get:87 http://archive.ubuntu.com/ubuntu focal-backports/universe i386 Packages [13,8 kB]
Get:88 http://archive.ubuntu.com/ubuntu focal-backports/universe Translation-en [16,3 kB]
Get:89 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [30,5 kB]
Get:90 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 c-n-f Metadata [880 B]
Get:91 http://archive.ubuntu.com/ubuntu focal-backports/multiverse amd64 DEP-11 Metadata [212 B]
Get:92 http://archive.ubuntu.com/ubuntu focal-backports/multiverse amd64 c-n-f Metadata [116 B]
Fetched 51,5 MB in 16s (3 183 kB/s)
Reading package lists...
W: Failed to fetch https://repo.skype.com/deb/dists/stable/InRelease  503  Service Unavailable [IP: 104.81.110.232 443]
W: Some index files failed to download. They have been ignored, or old ones used instead.

Running check 'APT cache'
rm -rf /var/lib/apt/lists/*
DEBIAN_PRIORITY=critical apt-get update
Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [128 kB]
Get:2 http://dl.google.com/linux/chrome/deb stable InRelease [1 825 B]
Err:3 https://repo.skype.com/deb stable InRelease
  503  Service Unavailable [IP: 104.81.110.232 443]
Get:4 http://archive.canonical.com/ubuntu focal InRelease [12,2 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Ign:6 http://packages.linuxmint.com una InRelease
Get:7 http://dl.google.com/linux/chrome/deb stable/main amd64 Packages [1 208 B]
Get:8 http://packages.linuxmint.com una Release [24,1 kB]
Get:9 http://packages.linuxmint.com una Release.gpg [833 B]
Get:10 http://archive.ubuntu.com/ubuntu focal-updates InRelease [128 kB]
Get:11 http://archive.ubuntu.com/ubuntu focal-backports InRelease [128 kB]
Get:12 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages [881 kB]
Get:13 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [3 564 kB]
Get:14 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [970 kB]
Get:15 http://packages.linuxmint.com una/main amd64 Packages [16,2 kB]
Get:16 http://security.ubuntu.com/ubuntu focal-security/main Translation-en [518 kB]
Get:17 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [74,6 kB]
Get:18 http://security.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [14,4 kB]
Get:19 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [3 768 kB]
Get:20 http://archive.ubuntu.com/ubuntu focal/main i386 Packages [718 kB]
Get:21 http://packages.linuxmint.com una/main i386 Packages [15,6 kB]
Get:22 http://archive.ubuntu.com/ubuntu focal/main Translation-en [506 kB]
Get:23 http://packages.linuxmint.com una/upstream i386 Packages [13,5 kB]
Get:24 http://archive.ubuntu.com/ubuntu focal/main amd64 DEP-11 Metadata [494 kB]
Get:25 http://packages.linuxmint.com una/upstream amd64 Packages [50,4 kB]
Get:26 http://security.ubuntu.com/ubuntu focal-security/restricted i386 Packages [42,5 kB]
Get:27 http://security.ubuntu.com/ubuntu focal-security/restricted Translation-en [527 kB]
Get:28 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 DEP-11 Metadata [212 B]
Get:29 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 c-n-f Metadata [584 B]
Get:30 http://security.ubuntu.com/ubuntu focal-security/universe i386 Packages [698 kB]
Get:31 http://archive.ubuntu.com/ubuntu focal/main amd64 c-n-f Metadata [29,5 kB]
Get:32 http://archive.ubuntu.com/ubuntu focal/restricted amd64 Packages [22,0 kB]
Get:33 http://archive.ubuntu.com/ubuntu focal/restricted i386 Packages [8 112 B]
Get:34 http://archive.ubuntu.com/ubuntu focal/restricted Translation-en [6 212 B]
Get:35 http://archive.ubuntu.com/ubuntu focal/restricted amd64 c-n-f Metadata [392 B]
Get:36 http://archive.ubuntu.com/ubuntu focal/universe i386 Packages [4 642 kB]
Get:37 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [1 040 kB]
Get:38 http://packages.linuxmint.com una/import i386 Packages [3 273 B]
Get:39 http://packages.linuxmint.com una/import amd64 Packages [7 783 B]
Get:40 http://packages.linuxmint.com una/backport amd64 Packages [90,3 kB]
Get:41 http://security.ubuntu.com/ubuntu focal-security/universe Translation-en [221 kB]
Get:42 http://security.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [160 kB]
Get:43 http://security.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [22,4 kB]
Get:44 http://security.ubuntu.com/ubuntu focal-security/multiverse i386 Packages [7 204 B]
Get:45 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [26,6 kB]
Get:46 http://security.ubuntu.com/ubuntu focal-security/multiverse Translation-en [6 448 B]
Get:47 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 DEP-11 Metadata [940 B]
Get:48 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 c-n-f Metadata [604 B]
Get:49 http://packages.linuxmint.com una/backport i386 Packages [27,1 kB]
Get:50 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [8 628 kB]
Get:51 http://archive.ubuntu.com/ubuntu focal/universe Translation-en [5 124 kB]
Get:52 http://archive.ubuntu.com/ubuntu focal/universe amd64 DEP-11 Metadata [3 603 kB]
Get:53 http://archive.ubuntu.com/ubuntu focal/universe amd64 c-n-f Metadata [265 kB]
Get:54 http://archive.ubuntu.com/ubuntu focal/multiverse i386 Packages [74,7 kB]
Get:55 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages [144 kB]
Get:56 http://archive.ubuntu.com/ubuntu focal/multiverse Translation-en [104 kB]
Get:57 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 DEP-11 Metadata [48,4 kB]
Get:58 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 c-n-f Metadata [9 136 B]
Get:59 http://archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [1 114 kB]
Get:60 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [3 955 kB]
Get:61 http://archive.ubuntu.com/ubuntu focal-updates/main Translation-en [600 kB]
Get:62 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [276 kB]
Get:63 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 c-n-f Metadata [18,0 kB]
Get:64 http://archive.ubuntu.com/ubuntu focal-updates/restricted i386 Packages [44,1 kB]
Get:65 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [3 922 kB]
Get:66 http://archive.ubuntu.com/ubuntu focal-updates/restricted Translation-en [548 kB]
Get:67 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 DEP-11 Metadata [212 B]
Get:68 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 c-n-f Metadata [604 B]
Get:69 http://archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [823 kB]
Get:70 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1 262 kB]
Get:71 http://archive.ubuntu.com/ubuntu focal-updates/universe Translation-en [303 kB]
Get:72 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [446 kB]
Get:73 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [29,3 kB]
Get:74 http://archive.ubuntu.com/ubuntu focal-updates/multiverse i386 Packages [8 440 B]
Get:75 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [29,7 kB]
Get:76 http://archive.ubuntu.com/ubuntu focal-updates/multiverse Translation-en [8 316 B]
Get:77 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [940 B]
Get:78 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 c-n-f Metadata [688 B]
Get:79 http://archive.ubuntu.com/ubuntu focal-backports/main i386 Packages [36,1 kB]
Get:80 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 Packages [45,7 kB]
Get:81 http://archive.ubuntu.com/ubuntu focal-backports/main Translation-en [16,3 kB]
Get:82 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 DEP-11 Metadata [7 996 B]
Get:83 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 c-n-f Metadata [1 420 B]
Get:84 http://archive.ubuntu.com/ubuntu focal-backports/restricted amd64 DEP-11 Metadata [216 B]
Get:85 http://archive.ubuntu.com/ubuntu focal-backports/restricted amd64 c-n-f Metadata [116 B]
Get:86 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages [25,0 kB]
Get:87 http://archive.ubuntu.com/ubuntu focal-backports/universe i386 Packages [13,8 kB]
Get:88 http://archive.ubuntu.com/ubuntu focal-backports/universe Translation-en [16,3 kB]
Get:89 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [30,5 kB]
Get:90 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 c-n-f Metadata [880 B]
Get:91 http://archive.ubuntu.com/ubuntu focal-backports/multiverse amd64 DEP-11 Metadata [212 B]
Get:92 http://archive.ubuntu.com/ubuntu focal-backports/multiverse amd64 c-n-f Metadata [116 B]
Fetched 51,5 MB in 15s (3 457 kB/s)
Reading package lists...
W: Failed to fetch https://repo.skype.com/deb/dists/stable/InRelease  503  Service Unavailable [IP: 104.81.110.232 443]
W: Some index files failed to download. They have been ignored, or old ones used instead.
 
Simplest way to reinstall is... Kinda Fomtat C: and install on clean HDD/SSD. This is how I "upgrade" my Lubuntu. I take another SSD and install Lubuntu on it. You can do the same. If you don't have spare SSD, then copy your data to external storage. Remove partitions and do clean Install. Then copy your data back.
 
I'm trying to do it, but get errors.

Thanks to all. Maybe sometimes I'll try to install the new version from scratch. I don't have any custom files on this laptop at all.

I just wanted to install LaTeX using texlive-full and Texmaker, but I can't do it (probably due to my old Linux version).
 
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