[Bug 1861990] Re: journalctl unable to read logs

[Dan Streetman]

> Ubuntu release: 18.04.4 LTS
> Package version: systemd 237-3ubuntu10.33

> journalctl --version gives
> systemd 244 (244)

You mention you're running Ubuntu release 18.04.4, which provides
systemd v237, but you appear to be running journalctl v244.  Are you
actually running Ubuntu pre-release 20.04?

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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Title:
  journalctl unable to read logs

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu release: 18.04.4 LTS
  Package version: systemd 237-3ubuntu10.33

  A simple journalctl command is now giving me this error

  Journal file /var/log/journal/ad9213e031ec2a16399a42515988884e/user-1001 at ae426ac82df44a8489f745ad63e8c9ea-000000000000215f-0005848bb1ab0334.journal uses an unsupported feature, ignoring file.
  Use SYSTEMD_LOG_LEVEL=debug journalctl --file=/var/log/journal/ad9213e031ec2a16399a42515988884e/user-1001 at ae426ac82df44a8489f745ad63e8c9ea-000000000000215f-0005848bb1ab0334.journal to see the details.
  -- No entries --

  When I invoke the recommended command

  SYSTEMD_LOG_LEVEL=debug journalctl
  --file=/var/log/journal/ad9213e031ec2a16399a42515988884e/user-1001
  @ae426ac82df44a8489f745ad63e8c9ea-000000000000215f-
  0005848bb1ab0334.journal

  I get

  Journal effective settings seal=no compress=no compress_threshold_bytes=8B
  Journal file /var/log/journal/ad9213e031ec2a16399a42515988884e/user-1001 at ae426ac82df44a8489f745ad63e8c9ea-000000000000215f-0005848bb1ab0334.journal uses incompatible flag lz4-compressed disabled at compilation time.
  Failed to open journal file /var/log/journal/ad9213e031ec2a16399a42515988884e/user-1001 at ae426ac82df44a8489f745ad63e8c9ea-000000000000215f-0005848bb1ab0334.journal: Protocol not supported
  mmap cache statistics: 0 hit, 1 miss
  Failed to open files: Protocol not supported

  journalctl --version gives

  systemd 244 (244)
  -PAM -AUDIT -SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP -GCRYPT -GNUTLS -ACL +XZ -LZ4 -SECCOMP +BLKID -ELFUTILS -KMOD -IDN2 -IDN -PCRE2 default-hierarchy=unified

  Looks like someone has reported the same thing to redhat
  (https://bugzilla.redhat.com/show_bug.cgi?id=1778809) with no answers
  yet.

  Were logs previously lz4-compressed and now are not?

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