I am facing a strange problem after installing the most recent updates (today - February 26th 2018, ~18:00) on my Zenbook.
After installing the updates, I told the system to reboot. Normally this is so fast I do not even get to see the shutdown screen, this time I did, for several minutes.
When the system finally rebooted, the boot process stopped at the console, telling me to either enter the root password for maintenance or hit Ctrl-D to continue.
Since the prompt gave me no indication of what might be wrong, and since I was impatient, I hit Ctrl-D. The display switched to a … kind of boot screen, I guess, a grey background with three green dots that lighted up one after the other. Then - nothing.
About the only thing I dislike about SSDs is that you cannot hear if they are busy, and the laptop has no HDD indicator LED. So I cannot tell if the system was doing anything at this point, or if it was just stuck.
I had the same problem on my desktop (also running Tumbleweed) where I was able pull the cart out of the mud by rolling back to a prior snapshot.
On the laptop, however, booting from an older kernel - 4.15.4 or 4.15.3 - or booting from a read-only snapshot gave the same result: Grey screen with three green dots that light up briefly, then nothing happens, as far as I can tell.
Just in case this is a hardware issue, I have powered down the laptop, disconnected the power supply and will try again in a few hours.
I mean, why would the system not boot properly off a snapshot? I have hosed my desktop twice over the last year (including today), and both times rolling back to a working snapshot has worked.
Unfortunately, as the grey-green boot screen is displayed, switching to a virtual console only shows me a - green - blinking cursor, but no login prompt, so I cannot look under the hood to see what might be going wrong.
Does anyone have a clue what is going on here or, better yes, how I can fix it? As long as my desktop works - I am writing this from my desktop, so it obviously works. - I can live without the laptop for a couple of days if that is what it takes, but I would like to avoid reinstalling it from scratch. (Which in turn would not be a disaster, either, but highly annoying.)
Thank you very much for any hints and suggestions,