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I apologise in advance: this question has probably been asked about 100 times but I can't seem to find a solution.

My problem: I'm trying to remove Qt Creator (and everything else Qt-related) from my laptop because I have been experiencing this problem with Qt creator 2.8. Having entered the command dpkg --get-selections | grep qt, I get a list of about 20-30 packages. Most of these packages are listed as install but some are listed as either deinstall or purge. When I attempt to apt-get purge the packages listed as purge or deinstall, I am informed that the package in question is not installed on my system. Why are the packages still listed when I have removed them?

1) Is there a way to remove all packages containing a specific keyword (e.g. by using grep)?

2) Why are some packages listed as purge or deinstall? I read somewhere that the command apt-get dselect-upgrade will perform these operations but this but that did not work.

3) Why is dpkg giving me a list of packaged that includes packages that I have removed?

There's obviously a lot I have to learn about package management in Ubuntu, any help is appreciated.

I am using Ubuntu 13.10.

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1. Yes 2. Because they are either purged or just deinstalled. 3. Because dpkg is listing it's database. Now, for the real question, can you just sudo apt-get remove them? –  Braiam Dec 13 '13 at 22:42
    
Could you elaborate on your answers for 1 and 2? Yes, apt-get remove works but I was hoping for an easier way than having to type the name of every package. –  Jack Jefferson Dec 13 '13 at 22:45

1 Answer 1

up vote 1 down vote accepted

You can use aptitude or apt-get. The problem with this is that just qt selects too many packages and you could very well uninstalling other stuff that shouldn't/doesn't need to be uninstalled:

sudo apt-get -s remove qt*

This won't remove any packages, but will let you see what will you be removing.

sudo apt-get install aptitude
sudo aptitude search '?and(?name(qt), ~i)'

This will search any package that has qt and it's installed. Change the search for remove to remove it.

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The first command you gave me outputs `Package 'packagename' is not installed, so not removed' for a long list of packages, most of which do not even contain 'qt'. The second command gives no output at all. –  Jack Jefferson Dec 14 '13 at 16:29
    
If the second command (I'm guessing aptitude search '?and(?name(qt), ~i)') doesn't give output, it means that you don't have any qt package installed. Congratz! You can also use aptitude search '?and(qt, ~i, !~M)' to broad the search. –  Braiam Dec 14 '13 at 16:38
    
OK so I've accomplished that task... now how do I stop dpkg listing packages that I've removed? –  Jack Jefferson Dec 14 '13 at 16:44
    
if you mean dpkg --get-selections it will show them whatever you do, since it list all package status not just the ones you have installed. –  Braiam Dec 14 '13 at 16:47
    
Oh, it seems I have been missing the point of --get-selections. Thanks for all your help. –  Jack Jefferson Dec 14 '13 at 16:50

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