su: authentication failure

How do I fix it? Tweet. su: Authentication failure. Warning: Enabling root is not recommended. I'll try reinstalling Not sure why, but it gave me the same authentication error. I'll try reinstalling vim-minimal though. Somehow I messed up sudoers/sudo badly. su test It asks me for a password, but when I enter the password, I get the following error: su: Authentication failure PS: I realize the dangers of adding passwords to bash scripts, but this is not what I am doing. usertwo, with password bar, without sudo rights. When I first turn on my new pc, I don't recall supplying a passord to user root. Viewed 8k times 1. Not sure why, but it gave me the same authentication error. Active 6 years, 11 months ago. If I try sudo -i, then I get "sudo: must be setuid root", if I run su, then I get "su: Authentication failue". The script asks the user to enter the password, and uses it in the script like this: I am the only user on this netbook and just want to use the same … On a VPS I own (hosted at bluevm.com), I have three users: userone, with password foo, and sudo rights. My sssd.conf is below [sssd] config_file_version = 2 services = nss,pam domains = LDAP debug_level = 8 [nss] #filter_users = root,ldap,named #filter_groups = root debug_level = 8 [pam] debug_level = 8 [domain/LDAP] cache_credentials = true id_provider = ldap auth_provider = ldap ldap_schema = rfc2307 ldap_group_member = memberuid ldap_uri = … I logged in the repair mode (as root) and run chmod +s /bin/su, did not work either. by Ramesh Natarajan on September 25, 2009. I will backup and reinstall. Question: I’m unable to do su – on Ubuntu. Answer: Let us address these two question one by one. It says “su: Authentication failure”. su not working when non-root (authentification failure) Ask Question Asked 6 years, 11 months ago. How can I issue command and use the same password as my user id, ler0nldb2? Ubuntu Tips: How To Enable Root User ( Super User ) in Ubuntu. Also, is it possible for me to login to Ubuntu using root account directly? ler0nldb2>su Password: su: Authentication failure ler0nldb2>sudo -i [sudo] password for ler0nldb2: root@ler0nldb2:~# In both cases, I used the same password. su - did not work.