[Koha] 18.05.01 up gradation login access denied

[Mark Alexander]

Excerpts from Arshad Iqbal's message of 2018-07-16 17:59:22 +0500:
> I have upgraded koha version 16.05 to 18.05.01. After  upgraded i am trying
> to login with master username and password but access denied to login error
> facing.

This is described in the release notes for 18.05:

https://koha-community.org/koha-18-05-released/

Quote:

It is no longer possible to use the database user (defined in
koha-conf.xml) to login into Koha.  You should first create a
superlibrarian patron and use it for logging in.
See the script misc/devel/create_superlibrarian.pl

Also see this bug:

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20489