I have an Asus laptop, running 12.04 since it was out, that now fails to boot properly into Gnome graphical environment. This occurred a month or two ago and I have been using a workaround until we were back to good enough internet to try to troubleshoot it. This is a dual boot system, but has been for years and that works ok. I can boot into windows if needed. The boot up sequence is as follows: turn on laptop, get Asus splash then the dual boot selection menu. Select ubuntu and boot begins. I can see it starting and stopping many processes as it goes along normally. At the end is shows starting and stopping Mount network filesystems, a 15 or so second pause and then Stopping boot sequence audit. Then it just hangs. I've left it an hour at this point and nothing happens. I am on tty07 and hung. My work around is as follows. I ctrl alt F1 to get to tty01. Then enter my username, password. Then at the commandline enter sudo lightdm, then sudo password. The graphical environment starts at this point. A few second later my graphical desktop comes up and and once again I have to enter my password. The graphical environment from this point forward seems to work normally. Shutdown from Gnome appears normal all the way to power down.
Obviously, I've found a workaround, but having to login 3 times everytime you start the machine is very inconvenient. Not sure how intact the security is either at this point
Any suggestions as to what to look at or what to do? Any help would be greatly appreciated.