Roundcube Mail 1.5.1 seems to be broken, the web app dies on loading the page
with this in the apache error log:

[Wed Dec 29 10:38:23.226604 2021] [php7:error] [pid 24894] [client
192.168.238.67:56186] PHP Fatal error:  require_once(): Failed opening required
'Roundcube/bootstrap.php'
(include_path='/srv/www/roundcubemail/vendor/pear/auth_sasl:/srv/www/roundcubemail/vendor/pear/console_commandline:/srv/www/roundcubemail/vendor/pear/console_getopt:/srv/www/roundcubemail/vendor/pear/crypt_gpg:/srv/www/roundcubemail/vendor/pear/mail_mime:/srv/www/roundcubemail/vendor/pear/net_ldap2:/srv/www/roundcubemail/vendor/pear/net_smtp:/srv/www/roundcubemail/vendor/pear/net_socket:/srv/www/roundcubemail/vendor/pear/pear-core-minimal/src:/srv/www/roundcubemail/vendor/pear/pear_exception:/srv/www/roundcubemail/program/lib:.:/usr/share/php7:/usr/share/php7/PEAR')
in /srv/www/roundcubemail/program/include/iniset.php on line 74, referer:
https://akari.eregion.home/