Trouble with installation on Ubuntu precise 12.04

I setup /etc/my.cnf file. I add the precise percona repos, and do the installation through the command:

apt-get install percona-server-server-5.5

As it is installing, it prompts me to set “root” password. I do that and confirm. It then tells me it can’t set the root password, it failed. Eventually, I get mysql started, but I can’t login. I try with no password, and I try with the one I attempted. Either way I fail.

root# mysql -p

Am I missing something very obvious? I’ve tried apt-get remove, and install again. Nothing seems to work.

Specific error messages:

120701 5:01:54 [Warning] Access denied for user ‘root’@‘localhost’ (using password: YES)120701 5:01:58 [Warning] Access denied for user ‘root’@‘localhost’ (using password: NO)

http://dev.mysql.com/doc/refman/5.5/en/resetting-permissions .html

Maybe you had an old mysql installation in your datadir. If this is the case, you have to use the password that you had in your old mysql installation.

Bye!