How do I bypass the authentication to set another password?
82
How do I reset a lost administrative password?
24377
Authentication with old password no longer supported, use 4.1 style passwords
20355
Sudo is also user login password - why? how to change?
4466
Want to change password my login
40422
Reset the password in Ubuntu / Linux Bash in Windows
145864
How do I get Ubuntu to ask me for a password at login again?
100535
How can we change root password?
151034
SSH: completly disabling password authentication
2634
Key based SSH login that requires both key AND password
32890
How do I set a password for guest login
145773
How do I change my Stack Exchange password?
150103
How can I retrieve an entry from /etc/passwd for a given username?
43064
How can I change (remove) a Seahorse password
23258
How to prevent system applications (like the Software Center) from asking for password?
113339
Use Windows Live ID, but login with a different password
21206
How to make password-less login work
111479
How do you keep the password hidden when invoked during the su command?