This could have the same reason as the bug filed by me:
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1882797
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https://bugs.launchpad.net/bugs/1845793
Title:
Since upgrade to
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: isc-dhcp (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1845793
Title:
S