If you haven't change anything with root permissions (like in the /etc or /usr/share directory) you can always delete the folders ~/.APPLICATION_NAME
, ~/.config/APPLICATION_NAME
, ~/.cache/APPLICATION_NAME
, ~/.local/share/APPLICATION_NAME
and the folders will be recreated with default settings after you reboot or relaunch the application (the symbol ~ means your home folder which in my case is /home/thanos). In fact you can delete anything inside your home folder (you might get an error if you delete the trash folder) but you will loose any data that is in there (for example bookmarks in firefox, panel items configuration, installed games in steam, playonlinux's virtual drives or whatever), so keep a copy or choose wisely what you delete.
For example in order to restore chromium settings you need to delete the folder ~/.config/chromium
and it will be recreated when you relaunch chromium (delete the whole folder in order to be recreated not just some files in it).
If you have changed something with root permissions and you haven't kept a backup, I don't think there's any way to restore settings to their original state without purging and reinstall the applications that you have problem with.
For example to completely reset chromium:
- Run in terminal:
sudo apt-get purge chromium
(you can also use synaptic).
- Delete the folders
~/.cache/chromium
and ~/.config/chromium
- Run in terminal
sudo apt-get install chromium
(you can also use synaptic or software center).