How can I remove gpg key that I added using apt-key add -?
I don't need the key in my server's keyring anymore. Is it possible to remove it? I added the key using this command:
curl http://repo.varnish-cache.org/debian/GPG-key.txt | apt-key add -
Thanks for helping
Solution 1:
First you need to find the key id of the key you added. Do this by the command:
sudo apt-key list
It will list all the keys that you have, with each entry looking like this:
pub 1024R/B455BEF0 2010-07-29
uid Launchpad clicompanion-nightlies
Once you have figured out which key to remove, use the command sudo apt-key del <keyid> where <keyid> is replaced with the actual keyid of the key you want to remove from your keyring.
$ sudo apt-key del B455BEF0
$ apt-key list | grep clicompan
$
Solution 2:
On 16.10 the short key id is no longer shown when you use the list command, but it is actually the last 8 characters of the long hex.
So for example the key id for the following key
/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
------------------------------------------------------
pub rsa4096 2012-05-11 [SC]
8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092
uid [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>
The key id will be EFE21092
Solution 3:
Update for Ubuntu 20.04
after running
sudo apt-key list
you should get the list of apt keys:
/etc/apt/trusted.gpg
--------------------
pub rsa4096 2016-04-12 [SC]
EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796
uid [ unknown] Google Inc. (Linux Packages Signing Authority) <[email protected]>
sub rsa4096 2019-07-22 [S] [expires: 2022-07-21]
pub rsa4096 2017-04-11 [SC] [expired: 2019-09-28]
D4CC 8597 4C31 396B 18B3 6837 D615 560B A5C7 FF72
uid [ expired] Opera Software Archive Automatic Signing Key 2017 <[email protected]>
pub rsa4096 2019-09-12 [SC] [expires: 2021-09-11]
68E9 B2B0 3661 EE3C 44F7 0750 4B8E C3BA ABDC 4346
uid [ unknown] Opera Software Archive Automatic Signing Key 2019 <[email protected]>
sub rsa4096 2019-09-12 [E] [expires: 2021-09-11]
pub rsa4096 2017-03-13 [SC]
8CAE 012E BFAC 38B1 7A93 7CD8 C5E2 2450 0C12 89C0
uid [ unknown] TeamViewer GmbH (TeamViewer Linux 2017) <[email protected]>
sub rsa4096 2017-03-13 [E]
under uid you have the name of the app, for example:
[ unknown] Opera Software Archive Automatic Signing Key 2019 <[email protected]>
and the key you want to delete is above it:
D4CC 8597 4C31 396B 18B3 6837 D615 560B A5C7 FF72 <-- THAT'S THE KEY
uid [ expired] Opera Software Archive Automatic Signing Key 2017 <[email protected]>
and you remove it by putting that key inside double or single quotes like this:
sudo apt-key del "D4CC 8597 4C31 396B 18B3 6837 D615 560B A5C7 FF72"