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sudo apt update && sudo apt upgrade
Hit:1 http://ftp.fsn.hu/debian buster InRelease
Hit:2 http://security.debian.org buster/updates InRelease
Hit:3 http://repo.mysql.com/apt/debian buster InRelease
Hit:4 http://ftp.fsn.hu/debian buster-updates InRelease
Hit:5 https://repo.skype.com/deb stable InRelease
Hit:6 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:7 https://deb.nodesource.com/node_12.x buster InRelease
Hit:8 https://download.mono-project.com/repo/debian vs-buster InRelease
Hit:9 https://download.sublimetext.com apt/stable/ InRelease
Hit:10 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
I also tried to download skype from their website and run installation, but it shows the same version as the one installed.
Then I tried removing all sources from sources.list.d and choosing main server for updates, but I still get this error, Unable to get list of packages.