FWIW, As was discussed, I checked into Grub2 and os-prober in older supported ubuntu (which may have similar incompatibility to e2fsprogs, thereby creating a multibooting issue with 18.04). After experimenting carefully with a 14.04+16.04+18.04 (GA kernels, no HWE specifically) BIOS-style triple boot, can confirm the grub ext4 support is all cross-compatible (14.04 can autodetect and boot 64bit,metadata_csum 18.04 from its' own grub2).
However, e2fsprogs is DEFINITELY an issue as above, definitely worth sorting-out whatever-happens to the 18.04 default filesystem options, in my view. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1365874 Title: Ubuntu 12.04 LTS, 14.04 LTS, 16.04 LTS do not support ext4 metadata checksumming To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/1365874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
