I do not have permission to install new software

Solution 1:

Install policykit-1-gnome

sudo apt install policykit-1-gnome

Open Terminal and launch gnome-software with sudo

sudo gnome-software

If this works for you, you can grant ownership of gnome-software run it without having to sudo it.(replace with your own username)

sudo chown <user>:<user> /usr/bin/gnome-software

Now you can use it without any issue.

This works for me in 18.04

Solution 2:

It seems to me that running gnome-software using sudo is not appropriate, since it would run it with more permissions than necessary. Elevated permissions is necessary to install software, but should not be needed for the UI itself.

To me the issue was resolved, on 20.04, after I re-installed gnome-software.

sudo apt-get install --reinstall gnome-software