For the first part, my guess would be something is wrong with the pathing of your volume and the bolt file is not actually there. Looks like you have /var/lib/influxdb/influxd.bolt and you might want /var/lib/influxdb2/influxd.bolt? You can also verify on your local machine if that bucket actually exists by using the boltdbweb tool to inspect the file. If that bucket is not there, something has gone wrong writing the file, and if it is there then it may be a recovery bug.
The Release notes have a bit of an explanation and a link out to the rest of the docs that may help explain the login capability influx CLI release notes | InfluxDB OSS 2.6 Documentation
