I seem to have solved this, at least for now, by increasing the sort_buffer_size even further, to 2M. Now I can access the web GUI and I’m no longer receiving the error 1038.
Sources I followed included:
- This thread on the Nextcloud forums
- This issue on the Nextcloud Github page
There are some suggestions that the Circles app (in Nextcloud) may also be a culprit. I did not do anything to disable it in this case, but I’m pointing it out in case that is helpful to others in a similar predicament.