My Ubuntu software center app doesn't have Visual Studio Code and show no application. Categories also are not working, just showing one blur app and no name in it. How can I solve this problem?
Snap Store shows empty categories (or doesn't show categories at all, only a few software picks on the front page and nothing more) when there are access errors on snapcraft.io server, which recently happens quite often. You can find the error messages in system log, or you can kill the running
snap-store process and run again
snap-store in terminal, as said in the comment above. If you see "access denied" errors in
snap-store output, then something happened again to snapcraft.io server. This is a temporary problem that goes away when they fix the server and it starts to operate normally again.
Remove the snap store and install Gnome Software
sudo apt autoremove snapd sudo apt install gnome-software
if you don't want to use snap store, there is an alternative without removing anything.
Try to login and go to the user you will sign in on (DON'T ENTER PASSWORD YET)
Look for the Gear icon on the lower-left and click it, if there isn't any, enter
sudo apt-get install gnome-settings
Choose Ubuntu or Ubuntu on Xorg(if you dont want to use the wayland windowing system)