root@computer-fun-area:~# apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
passenger-dev plesk-dovecot plesk-modsecurity-crs plesk-php71-bcmath
plesk-php71-dba plesk-php71-enchant plesk-php71-ldap plesk-php71-mbstring
plesk-php71-mysql plesk-php71-odbc plesk-php71-opcache plesk-php71-pdo
plesk-php71-pspell plesk-php71-soap plesk-php71-xml plesk-php71-xmlrpc
plesk-php72-dba plesk-php72-enchant plesk-php72-ldap plesk-php72-mbstring
plesk-php72-mysql plesk-php72-odbc plesk-php72-opcache plesk-php72-pdo
plesk-php72-pgsql plesk-php72-process plesk-php72-pspell plesk-php72-soap
plesk-php72-xmlrpc plesk-php73-bcmath plesk-php73-dba plesk-php73-enchant
plesk-php73-ldap plesk-php73-mbstring plesk-php73-mysql plesk-php73-odbc
plesk-php73-opcache plesk-php73-pdo plesk-php73-pgsql plesk-php73-process
plesk-php73-pspell plesk-php73-soap plesk-php73-xml plesk-php73-xmlrpc
psa-horde
0 upgraded, 0 newly installed, 0 to remove and 45 not upgraded.
N: Ignoring file 'plesk.list.ai_back' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'plesk.list.ai_back' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension