can't upgrade or install
133
How can I fix a 404 Error when using a PPA or updating my package lists?
48809
"The upgrade has aborted" error, how to proceed?
71368
Ubuntu 12.04 won't install
98844
upgrade 14.04 with errors and shows red sign on top
60199
FGLRX won't install: Unable to correct problems, you have held broken packages
118307
Why does upgrade from 12.04 to 12.10 using a CD/DVD still require download?
126740
Software & Updates crashes and will not open
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
109677
How do I to resolve unmet dependencies to uninstall and reinstall package
119920
Failed upgrade from Ubuntu 19.10 to 20.04 "Please update the microcode"
107993
Unable to upgrade Windows 10 edition from Home to Pro
128873
Windows update giving error 80070002 and manual update not working how to update?
1632
How do I fix a "Failed to download package files" error?
85943
Can't update or install apps on Ubuntu Touch
144507
No facility exists in Update Manager to upgrade to a new version, why?
76241
"no public key available" while upgrading using update-manager
23096
How to remove obsolete packages after failed release upgrade via do-release-upgrade on Ubuntu?