Cannot add or update software in software center,
728
Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?
56210
Are there alternatives to software center?
2432
Unable to correct problems, you have held broken packages
59046
Software center not loading software lists
136970
Error occurred in deployment step 'Add Solution': Operation is not valid due to the current state of the object.?
32788
Why is Ubuntu Software Center dropping previously provided applications?
12054
How do I deal with "unauthenticated sources" errors in the Software Center?
9723
How do I install software using the Ubuntu Software Center?
21188
The new software center in Ubuntu 16.04 shows no application data found
149428
How do I refresh the package list?
150104
Unable to download software center from package manager: 404 Not Found
94102
How do I add a software source?
30754
Cannot update: "No available releases found"
48179
How do I submit .jar file to the ubuntu software center
85943
Can't update or install apps on Ubuntu Touch
109409
Cannot update/install other software after failing to install LibreOffice
98511
16.04 Cannot install anything from Ubuntu Software center