[Bug 1930103] [NEW] isc-dhcp-server overwrites /etc/default/isc-dhcp-server during update

[Milan Kerslager]

Public bug reported:

Today unattended upgrade of ISC DHCPD overwrite config file /etc/default
/isc-dhcp-server and set wrong interface where daemon have to listen
(eno2 instead of br0 as was set before update).

I see no backup file of original config file so I had to investigate
where the problem was.

Update have to never overwrite config file and throw away previous
version.

/var/log/apt/history.log:
Start-Date: 2021-05-28  06:17:41
Commandline: /usr/bin/unattended-upgrade
Upgrade: isc-dhcp-server:amd64 (4.4.1-2.1ubuntu5, 4.4.1-2.1ubuntu5.20.04.2)
End-Date: 2021-05-28  06:17:47

root at linux:~# ls -l /etc/default/isc-dhcp-server
-rw-r--r-- 1 root root 629 May 28 06:17 /etc/default/isc-dhcp-server

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Today unattended upgrade of ISC DHCPD overwrite config file /etc/default
  /isc-dhcp-server and set wrong interface where daemon have to listen
  (eno2 instead of br0 as was set before update).
  
  I see no backup file of original config file so I had to investigate
  where the problem was.
  
  Update have to never overwrite config file and throw away previous
  version.
  
  /var/log/apt/history.log:
  Start-Date: 2021-05-28  06:17:41
  Commandline: /usr/bin/unattended-upgrade
  Upgrade: isc-dhcp-server:amd64 (4.4.1-2.1ubuntu5, 4.4.1-2.1ubuntu5.20.04.2)
  End-Date: 2021-05-28  06:17:47
+ 
+ root at linux:~# ls -l /etc/default/isc-dhcp-server
+ -rw-r--r-- 1 root root 629 May 28 06:17 /etc/default/isc-dhcp-server

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https://bugs.launchpad.net/bugs/1930103

Title:
  isc-dhcp-server overwrites /etc/default/isc-dhcp-server during update

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  Today unattended upgrade of ISC DHCPD overwrite config file
  /etc/default/isc-dhcp-server and set wrong interface where daemon have
  to listen (eno2 instead of br0 as was set before update).

  I see no backup file of original config file so I had to investigate
  where the problem was.

  Update have to never overwrite config file and throw away previous
  version.

  /var/log/apt/history.log:
  Start-Date: 2021-05-28  06:17:41
  Commandline: /usr/bin/unattended-upgrade
  Upgrade: isc-dhcp-server:amd64 (4.4.1-2.1ubuntu5, 4.4.1-2.1ubuntu5.20.04.2)
  End-Date: 2021-05-28  06:17:47

  root at linux:~# ls -l /etc/default/isc-dhcp-server
  -rw-r--r-- 1 root root 629 May 28 06:17 /etc/default/isc-dhcp-server

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