This bug was fixed in the package initramfs-tools - 0.133ubuntu8
---------------
initramfs-tools (0.133ubuntu8) eoan; urgency=medium
* Switch back to lz4 by default.
* Patch unmkinitramfs to cat possible lz4 archives first, as lz4 is
particular about enforcing .lz4 file extensions when operating on
files. LP: #1832108
-- Dimitri John Ledkov <x...@ubuntu.com> Mon, 10 Jun 2019 00:21:17
+0100
** Changed in: initramfs-tools (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1832108
Title:
unmkinitramfs fails with lz4 compressed initrds
Status in initramfs-tools package in Ubuntu:
Fix Released
Bug description:
unmkinitramfs fails with lz4 compressed initrds
Note:
$ lz4cat -t unmkinitramfs_Cz6Yl9
File extension doesn't match expected LZ4_EXTENSION (.lz4); will not process
file: unmkinitramfs_Cz6Yl9
And
$ lsinitramfs /boot/initrd.img
kernel
kernel/x86
kernel/x86/microcode
kernel/x86/microcode/.enuineIntel.align.0123456789abc
kernel/x86/microcode/GenuineIntel.bin
cpio: premature end of archive
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