Ubuntu – I/O schedulers set permanently? Kubuntu 20.04.1 64 bit

All your system logs in Ubuntu are handled by rsyslog which keeps its configuration in /etc/rsyslog.conf and /etc/rsyslog.d/.

For more information on how to configure rsyslog and the possible options visit the rsyslog.conf man page.

Opening /etc/rsyslog.d/50-default.conf you can see that one of the lines contains

*.*;auth,authpriv.none -/var/log/syslog*

Meaning that the file you are looking for in this case is any of the huge /var/log/syslog logs you will probably have.

You can see that the file name also starts with a -, this means that the file is cached before writing, its great but can leave you with a bad log, what you want is that the log is written as soon as there is a problem. Remove the dash and reboot or reload rsyslog and then make your computer crash again, check /var/log/syslog.

System account passwords can be found in /etc/shadow. You need root privileges to read the file. The passwords are hashed with SHA. Additional information can be found on the corresponding manpages.

Network or wifi passwords can be found in /etc/NetworkManager/system-connections. There is a file for each connection with its configuration, also you need root privileges to read them but the password isn't encrypted.

Passwords handled by Gnome's password store, the Gnome Keyring, are stored in ~/.gnome2/keyrings. The files are not human readable and should be accessed with Gnome's default password manager Seahorse. On older systems (before precise/12.04) wifi passwords were stored in Gnome Keyring and PINs for Mobile Broadband are still stored there.