Things went really wrong during my upgrade since I had to interrupt after not being abble to accept the license for microsoft fonts (the yes button was hidden behind the upgrade window and no way to access the "accept" button, my god). I rebooted using the recovery mode and tried to fix the broken packages...it managed to install the 10.10 kernels and I booted again using the 10.10 kernels and the recovery mode again. I managed to get the login prompt, but it looks like my user accout desappeared...any hints about how to proceed next?
Thanks!