Comment 12 for bug 1873325

I can confirm THAT also:

root@Scotty:~# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-5.4.0-29-generic
W: Possible missing firmware /lib/firmware/amdgpu/navi12_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_smc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_smc.bin for module amdgpu
I: The initramfs will attempt to resume from /dev/sdc3
I: (UUID=0d56817f-d127-457b-b6e1-5fd642a9520b)
I: Set the RESUME variable to override this.

So this doesn't has to do anything with 3rd-Party-PPA's because I don't have any. It's after a fresh install.

BUT update-initramfs doesn't throw any error anymore and runs through to the end. There are only the warnings left.

The system works well with this, after a reboot there are no problems despite these warnings:

root@Scotty:/boot# ll
insgesamt 189597
drwxr-xr-x 4 root root 4096 Mai 18 08:08 ./
drwxr-xr-x 20 root root 4096 Mai 16 17:27 ../
-rw-r--r-- 1 root root 237718 Apr 20 18:33 config-5.4.0-26-generic
-rw-r--r-- 1 root root 237718 Apr 29 15:34 config-5.4.0-29-generic
drwx------ 3 root root 512 Jan 1 1970 efi/
drwxr-xr-x 4 root root 4096 Mai 16 17:33 grub/
lrwxrwxrwx 1 root root 27 Mai 16 17:33 initrd.img -> initrd.img-5.4.0-29-generic
-rw-r--r-- 1 root root 80142634 Mai 16 17:31 initrd.img-5.4.0-26-generic
-rw-r--r-- 1 root root 80142137 Mai 18 08:08 initrd.img-5.4.0-29-generic
lrwxrwxrwx 1 root root 27 Mai 16 17:25 initrd.img.old -> initrd.img-5.4.0-26-generic
-rw-r--r-- 1 root root 182704 Feb 14 00:09 memtest86+.bin
-rw-r--r-- 1 root root 184380 Feb 14 00:09 memtest86+.elf
-rw-r--r-- 1 root root 184884 Feb 14 00:09 memtest86+_multiboot.bin
-rw------- 1 root root 4736015 Apr 20 18:33 System.map-5.4.0-26-generic
-rw------- 1 root root 4736015 Apr 29 15:34 System.map-5.4.0-29-generic
lrwxrwxrwx 1 root root 24 Mai 16 17:33 vmlinuz -> vmlinuz-5.4.0-29-generic
-rw-r--r-- 1 root root 11657976 Apr 23 09:55 vmlinuz-5.4.0-26-generic
-rw------- 1 root root 11657976 Apr 29 15:54 vmlinuz-5.4.0-29-generic
lrwxrwxrwx 1 root root 24 Mai 16 17:33 vmlinuz.old -> vmlinuz-5.4.0-26-generic
root@Schrotty:/boot# uname -a
Linux Scotty 5.4.0-29-generic #33-Ubuntu SMP Wed Apr 29 14:32:27 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
root@Scotty:/boot# date
Mo 18. Mai 08:14:51 CEST 2020

The initrd.img-5.4.0-29-generic was built successfully an works well and the amdgpu is loaded, if it works or not.