Error after reinstalling ubuntu

[Akito]

Manjaro kernel panic in a multiboot non-Manjaro GRUB

I installed Manjaro on a spare partition with three other Linux distros and Windows 7. After installation, all of them worked except Manjaro, which went into kernel panic. Error message said: “Kernel panic - not syncing VFS: Unable to mount root fs on unknown block (0,0)” BUT it successfully booted on the “fallback” option under Advanced Manjaro options. Online digging found some mention of this being a known Manjaro issue, which was described as Manjaro developers wanting users to use their …

[SOLVED] How to Fix Kernel Panic - Not Syncing: VFS: Unable to Mount Root FS...

Oracle Linux: Newly Installed Kernel Fails to Boot with Kernel Panic "Not...

Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Kernel panic-not syncing: VFS: unable to mount root fs on unknown- block(179,6) running Raspbian on top of NOOBS

https://forums.linuxmint.com/viewtopic.php?t=257229

not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Kernel panic-not syncing:VFS:Unable to mount root fs on unknown-block(1,0) -...

https://bbs.archlinux.org/viewtopic.php?id=234950

not syncing: VFS: Unable to mount root fs on unknown—block(0,0)