My GUI has changed into some crappy looking theme, I don't know why it happened and I want to get the default looks back!
It happened after I was mucking around trying to get the purple grub menu splash to go away, so that I could see dmesg during boot, and I followed the instructions in this accepted answer to do
sudo apt-get remove plymouth-theme-* and reboot. Unfortunately, now I've got an ugly Gnome and ironically the bootloader splash screen remained anyway.
Of course I first tried
sudo apt-get install plymouth-theme-ubuntu-logo plymouth-theme-ubuntu-text, which were the two that got removed by the previous step, but even after reboot it was still the ugly gnome.
Next I tried
gnome-tweak-tool but it was all set to ambiance theme which should be correct. And then I tried
lxappearance app which looked promising but didn't fix the problem either.
How can I get my old window and icons looks back?
- Desktop forgets theme? doesn't work for me