[Koha] Error after upgrading to 19.05

[Mark Tompsett]

Greetings,

It has been my experience that newer versions of 18.05 and higher are best 
run on stretch.
And don't use Debian Buster yet. :)

GPML,
Mark Tompsett

P.S. 404 errors could be a result of differences in your apache instance 
configuration file.
Upgrades don't change them. Compare the /etc/koha/...something.in file 
against your
installed file, and see what you might need to add in.