ERROR MESSAGE: Requires installation of untrusted packages
12054
How do I deal with "unauthenticated sources" errors in the Software Center?
20530
"package is in a very bad inconsistent state - you should reinstall it before attempting configuration."
76165
Unmet dependencies: not configured yet
118754
Package dependencies cannot be resolved
109677
How do I to resolve unmet dependencies to uninstall and reinstall package
153810
"Untrusted packages could compromise your system's security" appears while trying to install anything
134192
How to make sure I'm not using any proprietary software after installation?
86898
How to solve missing libmng.so.1 in Trusty (14.04) Package is no more available
32426
How to install packages?
44991
A lot of missing dependencies when I try to install all software
1564
Error -504 on appliation installation
73173
How to Fix Broken Packages?
18052
How to remove/install a package that is not fully installed?
1277
What does it mean that a package is "set to manually installed?"
3298
How do I resolve unmet dependencies after adding a PPA?
45526
How can I install packages without starting their associated services?
17208
What does this apt error message ("Download is performed unsandboxed as root...") mean?