I have a newish Lenovo Ideapad 510P with Nvidia graphics and I recently wanted to upgrade from 12.04 to the brand new 14.04. Ubuntu's website seemed to detail that the best way to do this was to upgrade to every release all the way through 14.04 (thought that was super lame). I began by updating to 12.10.
Everything went great until I restarted to finish installation. I received the classic purple splash but nothing beyond. Going into recovery and changing 'no splash' to 'nomodeset' allowed me to get to command line but I could still not see my desktop. Then I read that it may be because of Nvidia and that I needed to update the drivers. I performed 'sudo apt-get Nvidia-update' or a command along those lines (so much troubleshooting I've forgotten exactly). and it appeared to update everything successfully.
Now when I try to boot Ubuntu 12.10 I eventually receive: Mountall:Disconnected from Plymouth
All the troubleshooting seems to direct me to run additional commands but I cannot even seem to get that to load anymore. I cannot login, everything I try either ends in a loading Ubuntu purple screen, a flicker and a complete black screen, or Mountall:Disconnected from Plymouth. The only command line/terminal I seem to be able to access is grub.
Please help me and thank you in advance!