Comment 7 for bug 1786713

@Tim-

Its still not clear exactly what problem you're having. The version numbers you referenced in comment #5 suggest that you're compiling your own kernel from the 4.15.x mainline stable source (but the reference to "4.17.18" in the bug description confused me; was that a typo?).

Given your mentions of MODULE_SOFTDEP, crc32c, and 4.15.18, my guess is that perhaps you need to apply this patch to your repo:

    ext4: add MODULE_SOFTDEP to ensure crc32c is included in the initramfs
    https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/bionic/commit/?h=master-next&id=f1374d4425d95f4b26637525cb5a776994ce8042

Note that we have that patch pending for release in Ubuntu Bionic's kernel, but if you're building your own from the mainline stable v4.15.18 source, you'll need to apply it to your own repo.

If that doesn't resolve your issue, please describe the problem more explicitly, including the exact commands you're issuing and the specific error message that results.