[Bug 10910]

[JunyaKeller]

I prefer changing /etc/default/locale from en_US to en_GB in which changes the printing defaults from letter to A4:
LANG=en_GB.UTF-8

Debian/Ubuntu:
sudo /usr/sbin/update-locale LANG="en_GB.UTF-8"

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https://bugs.launchpad.net/bugs/10910

Title:
  Default page size for printing is letter