On a separate LTSP server the DHCP service fails to start after stopping
it. This is caused by a wrong Requires statement in the systemd unit
file. Instead of slapd.service, nslcd.service is required:

diff --git a/share/debian-edu-config/isc-dhcp-server.service.eth1_only b/share/debian-edu-config/isc-dhcp-server.service.eth1_only
index 46557e6b..f2b7fb58 100644
--- a/share/debian-edu-config/isc-dhcp-server.service.eth1_only
+++ b/share/debian-edu-config/isc-dhcp-server.service.eth1_only
@@ -1,7 +1,7 @@
 [Unit]
 Description=DHCP server
 After=network.target network-online.target
-Requires=slapd.service
+Requires=nslcd.service

 [Service]
 Type=forking

Wolfgang

Control: close -1
Control: fixed -1 2.12.23

This issue was fixed with upload of debian-edu-config 2.12.23 via
commit
https://salsa.debian.org/debian-edu/debian-edu-config/-/commit/7d7d8693ab2983322b90ed009c558ca2a2bfa399

So, closing this bug (as the bug's title has been addressed properly).

This follow-up description is not addressable anymore as the video
link is not available on peertube.debian.social anymore.

@Dashamir: please file a new bug and describe that next error, if
still relevant. Otherwise, we will likely stumble over it when running
our tests.

That said... I am closing this bug report as resolved.

Mike