can't install or upgrade packages
65099
Unable to install any updates through update manager/apt-get upgrade
108176
Ubuntu 16.04 broken kernel packages won't let me install or remove anything with apt-get
102559
How to install package from newer distribution?
127196
"Error processing package" - apt upgrade cannot run due to package configuration errors
41844
Package Install via Market sometimes fails and gives seemingly random error message
73173
How to Fix Broken Packages?
156977
Unable to install files with apt-get: "unable to locate package"
115722
Apt sources.list problem , packages not found?
77705
Unable to upgrade in ubuntu
62476
E: Package '' has no installation candidate
144507
No facility exists in Update Manager to upgrade to a new version, why?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
1520
How to install software or upgrade from an old unsupported release?
85724
Cannot update/get any packages. gedit not installed
2280
Package system is broken. How to fix it?
1632
How do I fix a "Failed to download package files" error?
77062
Updates stopped and fix-broken install is broken