This is strange. I tried:
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY_ID 2836CB0A8AC93F7A
But it did not work. I commented out one source at a time to narrow down which source was causing the problem. I now have all my sources commented out and I'm still getting the following terminal print out:
Here is a print out of my /etc/apt/sources.list
So what source is my system attempting to update when they're all commented out?
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY_ID 2836CB0A8AC93F7A
But it did not work. I commented out one source at a time to narrow down which source was causing the problem. I now have all my sources commented out and I'm still getting the following terminal print out:
Code:
$ sudo apt-get update Get:1 http://ppa.launchpad.net/kubuntu-ppa/beta/ubuntu bionic InRelease [20.7 kB] Err:1 http://ppa.launchpad.net/kubuntu-ppa/beta/ubuntu bionic InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2836CB0A8AC93F7A Reading package lists... Done W: GPG error: http://ppa.launchpad.net/kubuntu-ppa/beta/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2836CB0A8AC93F7A E: The repository 'http://ppa.launchpad.net/kubuntu-ppa/beta/ubuntu bionic InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
Code:
# deb cdrom:[Kubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main multiverse restricted universe # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. # deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted ## Major bug fix updates produced after the final release of the ## distribution. # deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. # deb http://us.archive.ubuntu.com/ubuntu/ bionic universe # deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. # deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse # deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. # deb http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb http://archive.canonical.com/ubuntu/ bionic partner # deb http://security.ubuntu.com/ubuntu/ bionic-security main restricted # deb http://security.ubuntu.com/ubuntu/ bionic-security universe # deb http://security.ubuntu.com/ubuntu/ bionic-security multiverse
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