Tried to install "PAT" winlink client for linux. OS is Ubuntu 20.04
(1) sudo apt update (See below for terminal output on step (1) )
(2) sudo apt -y install pat
Results from step (2) :
stan@stan-Latitude-E5530-non-vPro:~/Desktop$ sudo apt -y install pat
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package pat
stan@stan-Latitude-E5530-non-vPro:~/Desktop$
--------------------------------------------
(1) Results of first line :
[sudo] password for stan:
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu focal InRelease
Get:3 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:4 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Hit:5 http://archive.canonical.com/ubuntu focal InRelease
Hit:6 http://ppa.launchpad.net/nemh/systemback/ubuntu xenial InRelease
Hit:7 https://download.mono-project.com/repo/ubuntu stable-focal InRelease
Get:8 https://esm.ubuntu.com/apps/ubuntu focal-apps-security InRelease [7,568 B]
Hit:9 http://packages.microsoft.com/repos/code stable InRelease
Get:10 https://esm.ubuntu.com/apps/ubuntu focal-apps-updates InRelease [7,459 B]
Hit:11 http://ppa.launchpad.net/alexlarsson/flatpak/ubuntu focal InRelease
Get:12 https://esm.ubuntu.com/infra/ubuntu focal-infra-security InRelease [7,453 B]
Hit:13 https://download.mono-project.com/repo/ubuntu stable-xenial InRelease
Get:14 https://esm.ubuntu.com/infra/ubuntu focal-infra-updates InRelease [7,452 B]
Hit:15 http://archive.canonical.com focal InRelease
Hit:16 http://ppa.launchpad.net/dansmith/chirp-snapshots/ubuntu focal InRelease
Get:17 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Hit:18 http://ppa.launchpad.net/libreoffice/ppa/ubuntu focal InRelease
Hit:19 https://dl.winehq.org/wine-builds/ubuntu focal InRelease
Hit:20 http://ppa.launchpad.net/nrbrtx/python2-stuff/ubuntu focal InRelease
Hit:21 http://ppa.launchpad.net/savoury1/ffmpeg4/ubuntu focal InRelease
Hit:22 http://ppa.launchpad.net/savoury1/vlc3/ubuntu focal InRelease
Hit:23 https://download.virtualbox.org/virtualbox/debian focal InRelease
Hit:24 http://ppa.launchpad.net/wireshark-dev/stable/ubuntu focal InRelease
Hit:25 https://linux.teamviewer.com/deb stable InRelease
Get:26 http://us.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [875 kB]
Get:27 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages [643 kB]
Get:28 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [2,805 kB]
Get:29 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [2,416 kB]
Get:30 http://security.ubuntu.com/ubuntu focal-security/main Translation-en [379 kB]
Get:31 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [59.9 kB]
Get:32 http://security.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [13.1 kB]
Get:33 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [2,145 kB]
Get:34 http://us.archive.ubuntu.com/ubuntu focal-updates/main Translation-en [463 kB]
Get:35 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [275 kB]
Get:36 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 c-n-f Metadata [17.0 kB]
Get:37 http://us.archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [2,270 kB]
Get:38 http://security.ubuntu.com/ubuntu focal-security/restricted Translation-en [300 kB]
Get:39 http://security.ubuntu.com/ubuntu focal-security/universe i386 Packages [612 kB]
Get:40 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [875 kB]
Get:41 http://security.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [96.5 kB]
Get:42 http://security.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [19.1 kB]
Get:43 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 DEP-11 Metadata [936 B]
Get:44 http://us.archive.ubuntu.com/ubuntu focal-updates/restricted Translation-en [317 kB]
Get:45 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1,106 kB]
Get:46 http://us.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [746 kB]
Get:47 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [410 kB]
Get:48 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [25.5 kB]
Get:49 http://us.archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [944 B]
Get:50 http://us.archive.ubuntu.com/ubuntu focal-backports/main amd64 DEP-11 Metadata [8,004 B]
Get:51 http://us.archive.ubuntu.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [30.5 kB]
Fetched 17.3 MB in 1min 11s (242 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
11 packages can be upgraded. Run 'apt list --upgradable' to see them.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'https://download.mono-project.com/repo/ubuntu stable-focal InRelease' doesn't support architecture 'i386'
