How to remove a apt-key which I have added? [duplicate]

I added a key like this:

wget -q -O - | sudo apt-key add - sudo sh -c 'echo deb binary/ > /etc/apt/sources.list.d/jenkins.list' 

Now I want to remove this key. How can I do that? I don't know where it got added and how does it look like.

When I do sudo apt-key list it prints out few things on the console. Not sure which one is related to what I did above?

david@machine:~$ sudo apt-key list /etc/apt/trusted.gpg -------------------- pub 1024D/437D05B5 2004-09-12 uid Ubuntu Archive Automatic Signing Key <> sub 2048g/79164387 2004-09-12 pub 1024D/FBB75451 2004-12-30 uid Ubuntu CD Image Automatic Signing Key <> pub 4096R/C0B21F32 2012-05-11 uid Ubuntu Archive Automatic Signing Key (2012) <> pub 4096R/EFE21092 2012-05-11 uid Ubuntu CD Image Automatic Signing Key (2012) <> pub 1024D/D50582E6 2009-02-01 uid Kohsuke Kawaguchi <> uid Kohsuke Kawaguchi <> uid [jpeg image of size 3704] sub 2048g/10AF40FE 2009-02-01 /etc/apt/trusted.gpg.d//pubring.gpg ----------------------------------- pub 2048R/06634014 2013-01-26 uid OSP Team <> sub 2048R/732F28E7 2013-01-26 

3 Answers

apt-key add adds a key to /etc/apt/trusted.gpg by default.

These keys are from Ubuntu repositories:

pub 1024D/437D05B5 2004-09-12 uid Ubuntu Archive Automatic Signing Key <> sub 2048g/79164387 2004-09-12 pub 1024D/FBB75451 2004-12-30 uid Ubuntu CD Image Automatic Signing Key <> pub 4096R/C0B21F32 2012-05-11 uid Ubuntu Archive Automatic Signing Key (2012) <> pub 4096R/EFE21092 2012-05-11 uid Ubuntu CD Image Automatic Signing Key (2012) <> 

Then you're left only with:

pub 1024D/D50582E6 2009-02-01 uid Kohsuke Kawaguchi <> uid Kohsuke Kawaguchi <> uid [jpeg image of size 3704] sub 2048g/10AF40FE 2009-02-01 

Remove it by running:

sudo apt-key del D50582E6 

If you really want to make sure you're removing the right key, you could add the key again to a new keyring:

wget -q -O - | sudo apt-key --keyring /tmp/test add - 

Then list its contents:

sudo apt-key --keyring /tmp/test list 

Then you'll see the key you want to remove.

You can also directly remove key using

$ sudo apt-key list | grep 'teejee' 

You will get

/etc/apt/trusted.gpg.d/teejee2008-ppa.gpg 

Then,

$ sudo rm /etc/apt/trusted.gpg.d/teejee2008-ppa.gpg 

Just Test again with $ sudo apt-key list | grep 'teejee'

Open the software center, go to "Edit" → "Software Sources ..." → "Other Software" and you see a "Remove" button.