Kernel hopping, distro hopping, and running Arch alongside LM19. Two grub things are different than expected.
1. after getting rid of a kernel in LM19
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remove --purge linux-unsigned-image-4.17.0-generic
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sudo update-grub2
2. Arch documentation says it has to own grub (or whatever boot controler) to boot; that updating debian/ubuntu/mint grub will wipe out the Arch grub and one must go back to the arch live install media, chroot, mount to the arch install and repair its grub to have arch in the boot menu and to work. Prior, I did have my Monjaro at the top of the boot menu. After purging the mainline kernel as in 1 while in LM19, and the apparent auto updating of grub2, I still see Manjaro but it is now at the bottom. That makes me believe it was indeed the ubuntu grup2 that did the work. Yet I can still boot to the Arch distro.
Is the dogma now incorrect? Did the Arch grub actually get updated (while running LM19) even if it appears the grub version is ubuntu?
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grub-install --version
Not a big deal but I like to know whats going ongrub-install (GRUB) 2.02-2ubuntu8.3