====== Disable updates (Bionic) ======
<code bash>
systemctl disable apt-daily.timer
systemctl disable apt-daily-upgrade.timer
</code>

====== APT update resource overload ======
apt has a daily and weekly update on Ubuntu servers.  On servers with limited CPU and Memory this could pose an issue.  If the servers are inside the firewall and do not require any updates, security or otherwise, it helps to disable this.

The apt configurations as at ''/etc/apt/apt.conf.d'' directory

Of particular interest is the file ''10periodic''

The key parameters to set to 0 are below

<code>
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
</code>

===== Release upgrade check =====
Alongside apt updates are the Ubuntu release checks that run periodically and take up values resources.  To disable edit ''/etc/update-manager/release-upgrades'' and update ''Prompt=lts'' to ''Prompt=never''

===== cron jobs =====
The cron jobs that cause the issue are
  * /etc/cron.weekly/apt-xapian-index
  * /etc/cron.weekly/update-notifier-common
  * /etc/cron.daily/update-notifier-common
  * /etc/cron.daily/apt
  * /etc/cron.daily/apt-compat

The other option may be to disable execute on these files.  Actually only this may work as the settings don't seem to limit it!

<code bash>
chmod -x /etc/cron.weekly/apt-xapian-index
chmod -x /etc/cron.weekly/update-notifier-common
chmod -x /etc/cron.daily/update-notifier-common
chmod -x /etc/cron.daily/apt
chmod -x /usr/lib/ubuntu-release-upgrader/release-upgrade-motd
chmod -x /etc/cron.daily/apt-compat
</code>

===== Related =====
[[apt_upgrades|Automatic apt upgrades]]