root authentication failure

[sureshk89]

Hi,
I was using centos.Today i switched over to ubuntu, when i login as root i got authentication failure.

"~$ su -
Password:
su: Authentication failure"

the password is system password that i created when installing.
I installed squid, there i cannot edit squid.conf file. it shows as read only file.

The same way i edited in centos,it worked.
I am new to linux can anyone help me out

Thanks and regards
Suresh

[Roxoff]

don't use 'su', prepend your command with the tool 'sudo' - this'll ask you for your own login password rather than the root one.

If you have a lot of commands to issue, you can always do 'sudo bash' to get a command session for the root user.

[sureshk89]

Hi
Thanks. can you tell me how to edit read only file.
i tryed vi /etc/squid/squid.conf
it opens when i save it tells readonly.
Regards
Suresh.

[MikeTbob]

Again, use sudo.

sudo vi /etc/squid/squid.conf