15:38 <Jackneill> TJ-, for a brief moment i saw 2-3 lines of text, first line
is "error: no video mode activated"
15:38 <Jackneill> was unable to see more.
15:38 <Jackneill> but this is a successful boot no purple screen this time
15:38 <TJ-> Jackneill: so, GRUB_TERMINAL=console was successfully booted to
desktop?
15:39 <Jackneill> TJ-, yes, but its non-determinitsitc so its hard to tell
15:39 <Jackneill> if the error still exists or not
15:39 <Jackneill> requires many boots.
...
15:43 <Jackneill> TJ-, i got a bad boot this time.
15:43 <Jackneill> TJ-, hanging black screen with 2 lines: first is what i said
above, second: 'error: can't find command `hwmatch`'
15:45 <TJ-> Jackneill: the fact you can see the text is a good thing, as it may
point to the issue not being video at all, but possibly something else that is
hanging the entire system
...
15:49 <TJ-> Jackneill: "hwmatch" is part of the GRUB boot-loader, and (is
supposed) to be executed by GRUB at boot-time to check if the GPU is included
in a blacklist: "/boot/grub/grub.cfg:122: if hwmatch
${prefix}/gfxblacklist.txt 3; then ..." - so it appears the hand-over from GRUB
to Linux kernel is failing
So, in GRUB GFX mode, which sets the background colour to the Ubuntu
themed 'purple' mentioned in this bug, the display is cleared when GRUB
hands over to the Linux kernel. If the kernel is not starting for some
reason that purple screen is all the user will see.
With GRUB_TERMINAL=console the display is not in a GFX mode, but text
only, so we get to see some clue at least!
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https://bugs.launchpad.net/bugs/1829402
Title:
Purple screen hangup during boot
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