Comment 0 for bug 1875574

In freshly-installed 20.04 (amd64) by "linux" and "initrd.gz" found in "netboot.tar.gz", kernel panic is caused by the missing "initrd.img-*-lowlatency" on the first boot.

Procedure to reproduce the bug is as follows:
1.)Extract "netboot.tar.gz" and move the resulting directory "ubuntu-installer" under "/boot" in 18.04LTS (or on any systems with valid installation of grub2).
2.)Boot into the installer via grub, by manually typing in
"linux /ubuntu-installer/amd64/linux"
"initrd /ubuntu-installer/amd64/initrd.gz"
"boot"
3.)Proceed with setup as usual, selecting "Ubuntu Studio Desktop" and "OpenSSH Server" in the package selection section (and activate realtime processing for Jackd2 as prompted).
4.)Installation completes as usual and the machine is rebooted. Then the user experiences long silence.
5.)Force-shutdown PC, power-up again, enter GRUB by hitting Esc while in POST.
6.)Edit the lowlatency menu by typing "e", remove "quiet" from the kernel option.
7.)At this point the missing line containing "initrd" is becomes possible cause of the issue. Manually typed it in, and booted the machine.
8.)A Message saying that GRUB2 failed to load "initrd.img-*-lowlatency" shows up.
9.)Reboot the machine to see what happens when booted with "linux-*-generic" -> Boots fine.
10.)Missing "initrd.img-*-lowlatency" being the cause of this issue becomes clear. Run
sudo apt-get update; sudo apt-get install linux-*-lowlatency --reinstall; sudo update-grub2
11.)Problem solves.

This bug was present in 20.04(RC), and is also present in 20.04(release).
Hardware/Platform I have confirmed this are Lenovo ThinkPad X200, Sun Fire X2100, Dell Studio 540D.

Unfortunately I cannot point out which package causes the issue. Troubleshooting the issue is easy for the experienced, yet could be cumbersome for those who are not familiar with Ubuntu or any Debian-variant distros. Hope this gets fixed quickly.