Dear systemd folks,
We finally are going to upgrade from a very old systemd version 27 from
2011 to the current systemd v237. (Historical reasons.)
Anyway, I already was told about `systemctl daemon-reexec`, and we got
it working.
After that, looking at the output of `systemctl`, there are many units
from the old version, which were removed in the meantime.
```
$ systemctl --state=not-found
UNIT LOAD ACTIVE SUB
DESCRIPTION
● dev-hugepages.automount not-found active waiting
dev-hugepages.automount
● dev-mqueue.automount not-found active waiting
dev-mqueue.automount
● sys-kernel-debug.automount not-found active waiting
sys-kernel-debug.automount
● sys-kernel-security.automount not-found active waiting
sys-kernel-security.automount
● auditd.service not-found inactive dead
auditd.service
● console-kit-log-system-start.service not-found active exited
console-kit-log-system-start.service
● display-manager.service not-found inactive dead
display-manager.service
● hwclock-load.service not-found active exited
hwclock-load.service
● plymouth-quit-wait.service not-found inactive dead
plymouth-quit-wait.service
● plymouth-start.service not-found inactive dead
plymouth-start.service
● remount-rootfs.service not-found active exited
remount-rootfs.service
● syslog.service not-found inactive dead
syslog.service
● systemd-kmsg-syslogd.service not-found active running
systemd-kmsg-syslogd.service
● systemd-remount-api-vfs.service not-found active exited
systemd-remount-api-vfs.service
● systemd-sysusers.service not-found inactive dead
systemd-sysusers.service
● udev-retry.service not-found active exited
udev-retry.service
● udev-settle.service not-found active exited
udev-settle.service
● systemd-logger.socket not-found active listening
systemd-logger.socket
● systemd-shutdownd.socket not-found active listening
systemd-shutdownd.socket
● cryptsetup.target not-found active active
cryptsetup.target
● syslog.target not-found active active
syslog.target
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
21 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
```
Do I need to stop those manually beforehand, or is there another way to
clean up?
Is the recommended update procedure documented somewhere?
Kind regards,
Paul
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