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I do not understand why it is so common that people writes to a mailinglist and ask how to unsubscribe? If they were capable to subscribe, why are they not capable to read the footer in each mail:

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Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users

The exampel above is from the ubuntu user list but it is quite common on other lists too. Are you one of the people I talk about? Then check some mails from the list you want to unsubscribe for instructions before you ask/complain on the list.

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