When trying to upgrade nextcloud, I get the following error

<code>www-data@mail:/www/nextcloud$ php7.3 occ upgrade\\
An unhandled exception has been thrown:
OC\HintException: [0]: Memcache \OC\Memcache\APCu not available for local cache (Is the matching PHP module installed and enabled?)
www-data@mail:/www/nextcloud$ 
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www-data@mail:/www/nextcloud$ php7.3 occ upgrade
An unhandled exception has been thrown:
OC\HintException: [0]: Memcache \OC\Memcache\APCu not available for local cache (Is the matching PHP module installed and enabled?)
www-data@mail:/www/nextcloud$ 
To fix this, you need to install APC cache.

apt install php7.3-apcu
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apt install php7.3-apcu
For CLI, you need to edit PHP configuration file

vi /etc/php/7.2/cli/php.ini
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vi /etc/php/7.2/cli/php.ini
at the end of the file, add

apc.enable_cli = 1
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apc.enable_cli = 1
You can also enable apc for the current command with option

php7.3 -d apc.enable_cli=1 occ upgrade
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php7.3 -d apc.enable_cli=1 occ upgrade