I've managed to install influxdb2 and login to the web ui at localhost:8086 with the default username/pass admin/admin. But when I try to login now with the same credentials i get an error saying "Could not sign in" as shown here: 
Running systemctl status influxdb gives me this output: 
This persists after reboots and reinstalls of influxdb. Is there some way to hard reset the password or to disable the authentification?
Influxdb 2: Cannot sign in
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3 Answers
You can reset your InfluxDB 2 administrator password by recovering a admin token if you have access to the installation filesystem.
Find influxd.bolt on the host or in the container: /var/lib/influxdb2/influxd.bolt
Search this mixed text and binary json file for strings like your known username or token.
cat /var/lib/influxdb2/influxd.bolt | strings | grep "admin's Token"
{"id":"1234567898000000",
"token":"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx==",
"status":"active",
"description":"admin's Token",
With an admin-privileged token, you can update the password with the Influx Command Line Interface (CLI) command influx user password. For example:
$ docker exec -it 85e4df16a429 influx user password -n admin -t xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx==
? Please type your new password *********************
? Please type your new password again *********************
Your password has been successfully updated.
$
It happened the same to me, I created a user and then I forgot the password.
For those who work in Windows, go to C:\Users\YourName and delete .influxdbv2.
I forgot i created a new user, organization and bucket when first running influxdb.
I've managed to solve it by purging all the influxdb files by running dpkg --purge influxdb2 and then reinstalling.
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