Even less information about this one:

The flag06 account credentials came from a legacy unix system.
To do this level, log in as the level06 account with the password level06 . Files for this level can be found in /home/flag06.

I had a good idea what I’m looking for here, an easy to crack password hash in /etc/passwd rather than in the shadow file, so:

cat /etc/passwd | grep flag06

shows me the hash is ueqwOCnSGdsuM. I need to “crack” the hash. Time to get john the ripper on the case. At this point I didn’t have any other linux machines to hand, so I went to another tty session on this one and logged in a nebula and installed john (sudo apt-get install john). Then I ran john on the password file (john /etc/passwd) and he showed me the password. I switched over to flag06 account and the password worked as expected.