I've been running 17.10, which is completely updated and current, and trying to upgrade to 18.04. My system should be perfectly capable of the new distribution, it's a quad-core AMD system running nVidia GTX 550 graphics. (I also run Windows 10 on it, with all the latest upgrades, and a copy of Win 7 just for old times' sake.)
I've tried it multiple times using command-line (both with and without the Developer option) and using the GUI method, and every time, the upgrade seems to complete flawlessly, but in the end, it reboots to a black screen with command-line only. It wants a login and password (which I've never used before, always login automatically), then tells me "Welcome to Ubuntu 18.04 LTS", and some further tidbits of info, then returns to a command prompt, still on an otherwise black screen.
Obviously, this is a problem, so I've wiped it and restored to the previous build (again). Anybody have any ideas as to what's going wrong? The full text of how my screen appears after upgrading follows:
Ubuntu 18.04 LTS BigBoy tty1 [NOTE: BigBoy is my computer's name, no laughing] BigBoy login:dave Password: Welcome to Ubuntu 18.04 LTS (GNU/Linux 4.15.0-20-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https:ubuntu.com/advantage * Meltdown, Spectre and Ubuntu: What are the attack vectors, how the fixes work, and everything else you need to know -- https:ubu.one/u2know 0 packages can be updated 0 updates are security updates You have packages from the Hardware Enablement Stack (HWE) installed that are going out of support on 2016-08-04. There is a graphics stack installed on this system. An upgrade to a configuration supported for the full lifetime of the LTS will become available on 2016-07-21 and can be installed by running "update manager" in the Dash. The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. dave@BigBoy:"$