Greetings Following the 'destructions' at: https://wiki.koha-community.org/wiki/Debian#Before_you_begin have worked my way through until trying to set up plask $ sudo a2enmod headers proxy_http then: $ sudo koha-plack --enable libraryname # a2enmod proxy_http Considering dependency proxy for proxy_http: Enabling module proxy. Enabling module proxy_http. To activate the new configuration, you need to run: service apache2 restart root@memyself:/# service apache2 restart [ ok ] Restarting Apache httpd web server: apache2. root@memyself:/# koha-plack --enable library [FAIL] Error: Invalid instance name library: failed! # dpkg -l | grep plack ii libplack-middleware-logwarn-perl 0.001002-1 all converts warnings to log messages ii libplack-middleware-reverseproxy-perl 0.16-1 all module supporting apps to run as a reverse proxy backend ii libplack-perl 1.0047-1 all interface between web servers and Perl web applications so - - - I think I do have plack - - - - not sure how to get whatever needs to see libplack-perl looking in the right direction. (perl is already the newest version (5.28.1-6+deb10u1). - - - - if it matters.) TIA (just subscribed to the user list and haven't seen any questions on install so chose to cc the dev list - - - hopefully not deprecated behavior - - - - :-) !)