When clicking on the Clock applet (Clock version 2.26.0) in Gnome (Ubuntu Jaunty) a calendar is shown. Each week starts on Sunday, but I want Monday as starting day. How can I achieve this?
this depends on your locale.
you need to check LC_TIME change first_weekday from 1(sunday) to 2(monday)
i just googled and this seems quite a comprehensive guide:
Reference: http://dunedin.lug.net.nz/forums/showthread.php?t=208155 ; reformatted for superuser by me
Just set LC_TIME to a locale that starts its week on monday. eg: LC_TIME=en_GB.UTF-8
Make that change permanent by editing
The best way is to set your locale is on a per user setting, for example in gdm at login. If there is a specific need for more complex things, you can set the locale in /etc. Note that this will affect all users on the system.