certutil: could not authenticate to token NSS Certificate DB.: SEC_ERROR_IO: An I/O error occurred during security authorization.

I tried looking an old issue #12, but it doesn't seem to help

Commands I have executed:
`sudo chmod u+x ./mkcert`,
and tried this also later
`sudo chmod 0777 ./mkcert`,
then
`sudo ./mkcert -install`
I have libnss3-tools version `2:3.28.4-0ubuntu0.16.04.5` installed which seems the latest for Ubuntu 16.04 LTS
```
Using the local CA at "/home/user/.local/share/mkcert" ✨
ERROR: failed to execute "certutil -A": exit status 255

certutil: could not authenticate to token NSS Certificate DB.: SEC_ERROR_IO: An I/O error occurred during security authorization.
```