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:
the rsyslog file of the affected machine(s), if it exists.
On snap, these files are located as follows:
If you’re using packages, you’ll find the files in these locations:
If you’re specifically after the boot log of a machine, that’s found at