This bug was fixed in the package systemd - 242-7ubuntu3.8

---------------
systemd (242-7ubuntu3.8) eoan; urgency=medium

  * d/t/logind: skip if nonexistent /sys/power/state (LP: #1862657)
  * d/p/lp1859862-network-Do-not-disable-IPv6-by-writing-to-sysctl.patch:
    - enable ipv6 when needed (LP: #1859862)
  * d/p/lp1858412-journalctl-allow-running-vacuum-on-remote-journals-t.patch:
    - allow vacuuming journal 'root' dir (LP: #1858412)
  * d/rules: use meson --print-errorlogs instead of cat testlog
    - (LP: #1870811)
  * d/p/lp1776654-test-Synchronize-journal-before-reading-from-it.patch:
    - sync journal before reading from it (LP: #1776654)
  * d/p/lp1837914-journal-do-not-trigger-assertion-when-journal_file_c.patch:
    - do not crash if NULL passted to journal destructor (LP: #1837914)
  * d/e/initramfs-tools/hooks/udev:
    - Follow symlinks when finding link files to copy into initramfs
      (LP: #1868892)

 -- Dan Streetman <ddstr...@canonical.com>  Mon, 20 Apr 2020 09:44:51
-0400

** Changed in: systemd (Ubuntu Eoan)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1858412

Title:
  systemd vacuuming does not work for remote journals

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Bionic:
  Fix Committed
Status in systemd source package in Disco:
  Won't Fix
Status in systemd source package in Eoan:
  Fix Released

Bug description:
  [impact]

  attempting to vacuum journals using -D with the 'root' (in journald
  terms) journal directory fails to perform any vacuuming.  This can
  lead to journal files continually increasing in size and filling up
  the filesystem.

  [test case]

  see original description below.

  [regession potential]

  this removes a check in the code when iterating journal directories
  during vacuuming, so any regression would likely occur during
  vacuuming, possibly causing failure to vacuum.

  [scope]

  this is fixed upstream by commit
  c488660e6edb3c1375ab62514a8df035c3d712bf which is included starting in
  version 244, so this is already included in Focal.  This is needed for
  Eoan, Bionic, and Xenial.

  [original description]

  systemd has an issue in regard to vacuuming remote journals:
  https://github.com/systemd/systemd/issues/2376 - this affects 18.04 as
  this version still has this problem.

  Steps to reproduce on "Description:     Ubuntu 18.04.3 LTS":

  root@1:~# du -hs /var/log/journal/remote/
  8.6G  /var/log/journal/remote/
  root@1:~# journalctl -D /var/log/journal/remote --vacuum-size=100M
  root@1:~# du -hs /var/log/journal/remote/
  8.6G  /var/log/journal/remote/

  Would it be possible to backport this trivial patch
  https://github.com/systemd/systemd/pull/13924 into 18.04?

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