I am using Ubuntu 18.04 and I want also to allow to use my PC my brother.
It would not be a problem if it had a guest account but since 18.04 has no guest account I am wondering what data is accesable through a normal user account.
Would it be possible for my brother to change something in the system? Can he access WLAN password or similar data?
I would like to „trust my PC“ after he has used it.
You can add a "Standard" account (from Settings -> Detail -> Users -> Add user).
Standard users can use software like Firefox, IDE, a music player, or download files, read their own. They can also change settings that only affects themselves, such as his wallpaper.
Standard users cannot install/upgrade/uninstall software or change system-wide settings, e.g. WLAN password. Standard user can read/copy documents and photos in your Home directory and any file or created elsewhere but not able to modify/delete them.
