Public bug reported:
In Ubuntu 16.04 x86_64, I accidentally installed the nvidia driver on a
machine that actually has an intel graphics controller. This caused two
different failure modes in the time I was trying to figure out what was
wrong: sometimes the X server was unable to start at all, and other
times it loaded both nvidia and intel drivers, successfully deduced that
nvidia shouldn't have been loaded and unloaded it, and successfully
displayed the lightdm login screen, but then wouldn't let me log in
because the X server had failed to configure opengl properly, probably
because installing the nvidia driver caused the X server to be
configured to use the wrong mesa library.
This bug report is about the first failure mode mentioned above, i.e.,
the X server was unable to start at all on boot.
Instead, I was presented with a dialog that said "The system is running
in low-graphics mode" and offered me several choices for what to do
about it. I believe that this dialog was displayed by xdiagnose (version
3.8.4), which is why I'm filing this report for that package. If I'm
wrong, please redirect the bug report as appropriate.
The point of this bug report is that none of the recovery options
presented by the dialogs worked. In particular:
* Selecting "Try running with default graphics mode" didn't work: the
screen flashed several times and then settled on a black screen showing
nothing but the results of the boot-time fsck of the root filesystem. At
that point, I couldn't switch VTs or anything else; the system was
simply hosed and power-cycling was the only option.
* Selecting "Reconfigure graphics" (either "Use default (generic)
configuration" or "Use your backed-up configuration) just flashed and
returned me to the same screen asking me again which configuration to
use.
* Selecting "Troubleshoot the error" and then "Edit configuration file"
didn't work; I was not presented with an editor window, but rather I was
simply returned to the same prompt.
* "Exit to console login" didn't work; it had the same fsck-screen
failure mode described above for "Try running with default graphics
mode".
I also tried booting in recovery mode and selecting failsafe graphics
mode from the recovery menu. This didn't work either. See the attached
screenshot for what I got when I tried that. In particular, note the
"cp: cannot stat '/etc/X11/xorg.conf': No such file or directory" and
"/usr/share/xdiagnose/failsafeXinit: line 117: return: zenity: numeric
argument required" error messages.
** Affects: xdiagnose (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1576842
Title:
None of the recovery options from boot-time low-graphics mode work
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