10
Plymouth not working in Kubuntu
(lemmy.sdf.org)
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Most likely no, the config would probably remain and the new installation would not overwrite it
No idea, depends on how you configured it.
Copy the file and make a backup just in case, Add a new option there, make it the second one, then during boot manually chose that one, if something goes wrong, reboot and do nothing and you'll be back the same way you are now. Worst case scenario refind should guess the OS, and if that doesn't work you can boot into a Live USB and restore the backup.
If all goes wrong just install from scratch, you'll lose data in your
/
partition but that should be just system stuff, as long as/home
is in a different partition you shouldn't lose any personal data. If your/home
isn't in a different partition, next time you install your system consider this, it makes reinstalling in case you fuck up a breeze.