I reinstalled the Ubuntu boot-loader one day, and it showed an entry for Manjaro, but it kernel panicked on boot. After re-running the Manjaro installer, the kernel was fixed, but GRUB ignored Ubuntu. I recently installed OpenSUSE and the same predicament is occurring again; so how would I go about fixing this kernel panic without having to reinstall GRUB2?
How can I configure Manjaro in GRUB2 without re-running the Manjaro installer?
grub2;boot loader;kernel panic;manjaro
That is possibly considered as a bug, but for Manjaro perhaps it is a feature, making Manjaro the prefered boot OS for your system.  A panic situation occurs when it gets upset by another installer.I remember hearing on the Linux Luddites podcast that the Manjaro installer does something similar to this, perhaps on purpose.  It is directly addressed by the Majaro team, here, in a very involved discussion, which doesn't seem quite resolved, even yet.You have to restore GRUB in one way or another (for just a couple of examples), after installation, if you do not like this behavior.