gnome-shell-extensions-user-theme won't install due to unmet dependencies
Solution 1:
I was having a similar problem. gnome-shell-extensions-user-theme is 3.2 whereas the shell is 3.4. Shell extensions seem to be handled by installing from https://extensions.gnome.org/ rather than yourself via package manager.
Solution 2:
Try ;
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install -f
Then try installing gnome-shell-extensions-user-theme
again
sudo apt-get install gnome-shell-extensions-user-theme
If you get any error message with those first 3 commands, post back or use pastebin
Solution 3:
Installing from here: https://extensions.gnome.org/extension/19/user-themes/ ended up working for me. Had the exact same error msg.
Notes ubuntu precise -> gnome3 shell 64bit