You can find the location of all MAAS log files in the following Document:
If at all possible, capture at least the following logfiles, for the time period surrounding your error situation:
maas.log
regiond.log
rackd.log
the rsyslog file of the affected machine(s), if it exists.
On snap, these files are located as follows:
/var/snap/maas/common/log/maas.log
/var/snap/maas/common/log/regiond.log
/var/snap/maas/common/log/rackd.log
/var/snap/maas/common/log/rsyslog/$MACHINE_NAME/$RELEVANT_DATE/messages
If you’re using packages, you’ll find the files in these locations:
/var/log/maas/maas.log
/var/log/maas/regiond.log
/var/log/maas/rackd.log
/var/log/maas/rsyslog/$MACHINE_NAME/$RELEVANT_DATE/messages
If you’re specifically after the boot log of a machine, that’s found at /var/log/boot.log