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I am using 11.04 with Synaptic Package Manager (Ver 0.70). When I select 'Status' and try to delete packages from the 'Not Installed (residual config)' option, although I can select these old applications (such as Banshee and Evolution which I don't use) and 'mark for removal', the 'Apply' button is not active and remains greyed out. I assume that I am administrator as I am the only user of the machine and can use the 'sudo' prompt in terminal. What am I doing wrong?

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That is a known bug. You can remove the residual config files without synaptic using this handy one-liner:

aptitude -F %p search '~c' | xargs sudo dpkg -P

You may have to install aptitudeInstall aptitude if you haven't done that yet.

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sudo aptitude purge ~c is more than enough. – enzotib Aug 17 '11 at 16:30

If you have sudo privileges, try:

sudo apt-get remove --purge banshee evolution

It should do the same thing as what you would do in Synaptic. You can do this for all packages with remaining configs.

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