Actually, please make sure that you the following package installed.
(focal-amd64)root@impulse:~/bind9-libs-9.11.16+dfsg# apt-cache policy
libisc-export1105
libisc-export1105:
Installed: 1:9.11.16+dfsg-3~ubuntu1
Candidate: 1:9.11.16+dfsg-3~ubuntu1
Version table:
*** 1:9.11.16+dfsg-3~ubuntu1 500
500 http://192.168.10.7/ubuntu focal-updates/main amd64 Packages
100 /var/lib/dpkg/status
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Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu.
https://bugs.launchpad.net/bugs/1872106
Title:
isc-dhcp-server crashing constantly [Ubuntu 20.04]
Status in isc-dhcp package in Ubuntu:
Confirmed
Status in isc-dhcp source package in Focal:
Confirmed
Bug description:
isc-dhcp-server crashing constantly (sometimes within seconds or minutes,
sometimes within hours) with the following error messages:
Apr 10 17:45:25 xxx dhcpd[140823]: Server starting service.
Apr 10 17:45:25 xxx sh[140823]: ../../../../lib/isc/unix/socket.c:3361:
INSIST(!sock->pending_send) failed, back trace
Apr 10 17:45:25 xxx sh[140823]: #0 0x7f3362f59a4a in ??
Apr 10 17:45:25 xxx sh[140823]: #1 0x7f3362f59980 in ??
Apr 10 17:45:25 xxx sh[140823]: #2 0x7f3362f957e1 in ??
Apr 10 17:45:25 xxx sh[140823]: #3 0x7f3362d3c609 in ??
Apr 10 17:45:25 xxx sh[140823]: #4 0x7f3362e78103 in ??
Apr 10 17:45:25 xxx systemd[1]: isc-dhcp-server.service: Main process exited,
code=killed, status=6/ABRT
Apr 10 17:45:25 xxx systemd[1]: isc-dhcp-server.service: Failed with result
'signal'.
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https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1872106/+subscriptions
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