MySQL root access denied. Where do i change the password?

Hi!

I'm trying to use the stable Octopus installation script, but it fails.

At first, it produces some "sed: -e expression #1, char 21: unterminated `s' command" errors and continues.

But then it said that it can't connect to MySQL using the public IP address. It also complained about a non-existing directory:
AegirSetupC.sh.txt: line 1766: cd: /data/disk/octo/aegir/distro/001/sites/octo.barra.example.com: No such file or directory

So i used Chive to add a privilege for root user to accept any host. Then i used mysql console client to flush privileges. Then i ran Octopus installation script again, but it still failed with a different error:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

Now it tries to access locally but still fails. I might have inputted the password wrong when i installed Barracuda. But where does it store the password?

PS How do i delete an instance of Octopus after an unsuccesful install attempt, so that i can retry installing it? Removing /data/disk/octo seems to be not enough.