I couldn't upadate and upgrade software.it showing some errors
991
How can I fix apt error "W: Target Packages ... is configured multiple times"?
120161
Ubuntu 19.04 problems install upgrades
12578
How do I upgrade to a newer version of Ubuntu?
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error
35190
"Software Updater" & "Software & Updates" not working
136970
Error occurred in deployment step 'Add Solution': Operation is not valid due to the current state of the object.?
126740
Software & Updates crashes and will not open
8962
How to install multiple versions of the same software?
119920
Failed upgrade from Ubuntu 19.10 to 20.04 "Please update the microcode"
46461
Unsupported software?
86777
Distribution upgrade problem "No new release found"
109409
Cannot update/install other software after failing to install LibreOffice
12054
How do I deal with "unauthenticated sources" errors in the Software Center?
51768
Could not calculate the upgrade, what happened?
76905
Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application
2280
Package system is broken. How to fix it?
74990
Error while trying to upgrade from Ubuntu 18.04 to 18.10: "Please install all available updates for your release before upgrading."