Getting warnings: The following packages cannot be authenticated!
34069
Why am I getting authentication errors for packages from an Ubuntu repository?
156977
Unable to install files with apt-get: "unable to locate package"
16736
"The following packages have been kept back:" Why and how do I solve it?
155918
What information do I need to solve an APT dependency issue?
47808
"The following packages were automatically installed and are no longer required:" what to do?
97771
"The package lists or status file could not be parsed or opened"
127686
Problem using package acronym
26308
How to solve "Unable to find expected entry 'restricted/binary-1386/Packages' Wrong sources.list entry or malformed file"?
102559
How to install package from newer distribution?
12054
How do I deal with "unauthenticated sources" errors in the Software Center?
143086
Cannot authenticate without a password
64509
Can't update from official repositories [Error 409]
74763
Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution)
12773
The requested package is unknown
78011
Unable to install package post adding ppa
117852
"Package dependencies cannot be resolved" error when installing software
32220
How to resolve Unmet dependencies error?