i have a big problem with my Ubuntu PC. When i try sometigng need sudo or su, nothing is working and the OS Upgrade too, when i write the root password to the su command i have a "autentication error", same in the upgrades and when i try the sudo command to install something i don't have error message and nothing happen. I was tring to make samba work when all goes wrong. Some help!? Thanks! Edit SSH connection refused and connection closed if i try to login from secondary PC I can't access recovery mode... With the autologin i can access the system, if i logout and try to login again return the autentication error