Some troubles with Mint 17 Qinia. (ubuntu 14-04 based).
After pwr52 installation, my laptop freezes at boot up (MDM doesn't start)
My workaround is to edit the file:
/etc/init/mdm.conf
And comment out the line (with #):
test -f /etc/profile && . /etc/profile
After reboot, the problem is solved.
Furthermore, don't miss to install xterm which is not automatically installed with Qinia and choose english for local time (because of the use of Berkley DB)
sudo apt-get install xterm
/Bruno