Comment 4 for bug 1792965

As per discussion on the call:

1. This issue has been seen multiple times most recently.
2. Solutions QA has changed the way how they install and configure MAAS, by re-using a previously used hardware.
3. MAAS 2.3.5 has not changed in quite a while.
4. Since there's been environmental changes, this could be related and the reason why this issue surfaces.

AS such, given that the error message clearly shows that there's another DHCP server running when MAAS' DHCP is being brought up, could you please provide the following information:

1. The steps you take you install MAAS on your re-usable environment and any logs of the installation process (e.g. /var/log/apt/{history,term}.log of the installation)
2. The steps you take to clean-up your environment
3. After cleaning up your environment, is isc-dhcp installed? is isc-dhcp left running? (ps faux | grep dhcpd && dpkg -l | grep isc-dhcp)