I’m making an attempt to replace a course of used to remaster the Ubuntu 18.04 set up picture for 20.04 and operating into an issue with extracting the initrd archive.
The command used is
cpio -id --no-absolute-filenames. Once I use this similar command to extract the initrd picture from the 20.04 picture, it extracts
kernel/x86/microcode/AuthenticAMD.bin and stops.
Inspecting initrd file contents I can see a “TRAILER” part displaying that there are a number of archives within the file. As recommended in different threads about cpio archives, I attempted to extract the compound archive as such:
cat initrd | whereas cpio -id --no-absolute-filenames; do :; carried out. On this case, the primary entry extracts however then it has a bunch of “zero blocks” and does not extract the rest.
Does anybody know the way this archive was created or the way to extract it?