How to handle apt-get update failing to fetch old packages *without* upgrading
1520
How to install software or upgrade from an old unsupported release?
59900
How to safely abort apt-get install?
110896
Package installation - Outdated repository
90937
apt-get update errors
21382
What does "sudo apt-get update" do?
113442
apt-get not working on Ubuntu 16.04, problems with kernel packages
35146
Will apt-get dist-upgrade upgrade my system to newer version?
53588
How do remove the CD / DVD install as a source for apt-get packages when installing new features?
2564
apt-get cannot connect to Ubuntu archives
110148
Why does `do-release-upgrade` skip a version?
24165
Upgrade to version newer than repositories
66915
How to request a package upgrade in the next Ubuntu release
135985
Apt-get saying "Unable to correct problems, you have held broken packages."
94171
Why Does Software Updater Say No updates Available, but apt-get upgrade Shows updates available?
140893
Error when using apt-get update
9896
How do I get and modify the source code of packages installed through apt-get?
145400
Error when trying sudo apt-get update - Python related?