PhpMyAdmin after php upgrade shows Internal Server Error

Hestia doesn’t use mpm_prefork anymore, it uses mpm_event and also, doesn’t use php module.

What I would do:

Remove php apache libraries (if you have libapache2-mod-php8.0 remove it too):

apt remove libapache2-mod-php8.2 libapache2-mod-php8.3

Remove php 8.0 and install 8.2:

v-delete-web-php 8.0
v-add-web-php 8.2

Disable php and mpm_prefork modules. Enable mpm_event and restart apache2:

a2dismod php
a2dismod mpm_prefork
a2enmod mpm_event
systemctl restart apache2

If doesn’t work, check that your /etc/apache2/apache2.conf file looks like this:

# It is split into several files forming the configuration hierarchy outlined
# below, all located in the /etc/apache2/ directory:
#
#       /etc/apache2/
#       |-- apache2.conf
#       |       `--  ports.conf
#       |-- mods-enabled
#       |       |-- *.load
#       |       `-- *.conf
#       |-- conf.d
#       |       `-- *

# Global configuration
PidFile ${APACHE_PID_FILE}
Timeout 30
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 10

<IfModule mpm_prefork_module>
    StartServers          8
    MinSpareServers       5
    MaxSpareServers      20
    ServerLimit         256
    MaxClients          200
    MaxRequestsPerChild 4000
</IfModule>

<IfModule mpm_worker_module>
    StartServers          2
    MinSpareThreads      25
    MaxSpareThreads      75
    ThreadLimit          64
    ThreadsPerChild      25
    MaxClients          200
    MaxRequestsPerChild 4000
</IfModule>

<IfModule mpm_event_module>
    StartServers          2
    MinSpareThreads      25
    MaxSpareThreads      75
    ThreadLimit          64
    ThreadsPerChild      25
    MaxClients          200
    MaxRequestsPerChild 4000
</IfModule>

# These need to be set in /etc/apache2/envvars
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}
#User www-data
#Group www-data

AccessFileName .htaccess

<Files ~ "^\.ht">
    Order allow,deny
    Deny from all
    Satisfy all
</Files>

DefaultType None
HostnameLookups Off

ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn

# Include module configuration:
Include mods-enabled/*.load
Include mods-enabled/*.conf

# Include list of ports to listen on and which to use for name based vhosts
Include ports.conf

LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%a %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%a %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
LogFormat "%b" bytes

IncludeOptional conf.d/*.conf
IncludeOptional conf.d/domains/webmail.*.conf
IncludeOptional conf.d/domains/*.conf

# Include the virtual host configurations:
#Include sites-enabled/

ErrorDocument 403 /error/403.html
ErrorDocument 404 /error/404.html
ErrorDocument 500 /error/50x.html
ErrorDocument 501 /error/50x.html
ErrorDocument 502 /error/50x.html
ErrorDocument 503 /error/50x.html
ErrorDocument 506 /error/50x.html
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