Referring to Bug 20639 - missing dependencies for plack (Running on Ubuntu 16.04 and Koha 17.11, mariadb) The bug fix says to install libplack-perl libcgi-emulate-psgi-perl I installed those dependencies. However, it still was missing: libcgi-compile-perl I installed that. HOWEVER, after installing both these dependencies, I am getting the following error in my plack-error.log Error while loading /etc/koha/plack.psgi: Can't locate Koha/Exceptions/Exception.pm: ./Koha/Exceptions/Exception.pm: Permission denied at /usr/share/perl/5.22/base.pm line 97. ...propagated at /usr/share/perl/5.22/base.pm line 106. BEGIN failed--compilation aborted at (eval 64) line 3. BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Exceptions.pm line 69. Compilation failed in require at /usr/share/koha/lib/Koha/DateUtils.pm line 22. BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/DateUtils.pm line 22. Compilation failed in require at /usr/share/koha/lib/C4/Log.pm line 30. BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Log.pm line 30. Compilation failed in require at /usr/share/koha/lib/Koha/Config/SysPref.pm line 26. BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Config/SysPref.pm line 26. Compilation failed in require at /usr/share/koha/lib/C4/Context.pm line 105. BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Context.pm line 105. Compilation failed in require at /usr/share/koha/lib/C4/Koha.pm line 26. BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Koha.pm line 26. Compilation failed in require at /etc/koha/plack.psgi line 30. BEGIN failed--compilation aborted at /etc/koha/plack.psgi line 30. -- Sent from: http://koha.1045719.n5.nabble.com/Koha-general-f3047918.html