It is not clear whether this is bug or not.
Selecting "Main Server" would allow selecting the "Sources" checkbox;
while if any other server is selected, then the box doesn't get checked.
** Changed in: software-properties (Ubuntu)
Status: New => Confirmed
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[karmic] On "Software Sources"-dialog the check mark for "Source code" don't
displayed
https://bugs.launchpad.net/bugs/412665
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