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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
1

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.

2

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'

6

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

3

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