Linked Questions

614 votes
15 answers
1.2m views

How do I fix the GPG error "NO_PUBKEY"?

I added some extra repositories with the Software Sources program. But when I reload the package database, I get an error like the following: W: GPG error: http://ppa.launchpad.net trusty InRelease:...
Agmenor's user avatar
  • 16.2k
14 votes
1 answer
25k views

W: GPG error: The following signatures couldn't be verified because the public key is not available [duplicate]

On my Ubuntu 14.04, I followed http://mirror.its.dal.ca/cran/bin/linux/ubuntu/README to add the following to /etc/apt/sources.list deb http://stat.ethz.ch/CRAN/bin/linux/ubuntu trusty/ When I run ...
Tim's user avatar
  • 25.1k
0 votes
0 answers
1k views

W: Target Packages (Packages) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/sublime-text.list:1 [duplicate]

Ran: sudo apt-get update Output: . . . Reading package lists... Done W: Target Packages (Packages) is configured multiple times in /etc/apt/sources.list:51 and /etc/apt/sources.list.d/sublime-text....
Sakthivel A R's user avatar
120 votes
4 answers
132k views

How do I deal with "unauthenticated sources" errors in the Software Center?

Any install that I'm trying through the Software Center is telling me: Requires installation of untrusted packages: The action would require the installation of packages from not authenticated ...
b. e. hollenbeck's user avatar
49 votes
2 answers
114k views

W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:

I get the following error when i do sudo apt-get update W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: ...
Aniket Thakur's user avatar
18 votes
3 answers
17k views

Intel graphic ppa error after apt-get update

how can i ignore this message? W: GPG error: https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease: The following signatures couldn't be verified because the public key is not available: ...
landsman's user avatar
  • 469
3 votes
0 answers
7k views

How to fix GPG error for extras.ubuntu.com oneiric Release? [duplicate]

Possible Duplicate: What is the easiest way to resolve apt-get BADSIG GPG errors? Some days ago my apt-get update has suddenly began to throw W: GPG error: http://extras.ubuntu.com oneiric ...
Ivan's user avatar
  • 57k
2 votes
1 answer
933 views

How to handle phalconphp GPG issue

I'm trying to update my nodejs installation, and phalconphp is getting in the way. When I run apt-get update, I get this complaint Err:13 https://packagecloud.io/phalcon/stable/ubuntu xenial ...
quickshiftin's user avatar
1 vote
2 answers
2k views

How do I install a specific lower minor version of gcc using package manager?

I am running an Ubuntu 14.04-4 64bit. gcc --version returns (Ubuntu 4.8.4-2ubuntu1~14.04.1) 4.8.4 Yet, I need version 4.8.2-10. What I tried: I found the specific gcc version in a debian snapshot ...
langlauf.io's user avatar
0 votes
0 answers
293 views

apt-get giving warnings on programs I've uninstalled

I uninstalled a program using the command sudo apt-get --purge remove programName but when I ran sudo apt-get update it still return errors on that program's keys. So I then uninstalled the program'...
Shawn Zamperini's user avatar
0 votes
1 answer
118 views

Can't update anything on computer, getting GPG error [duplicate]

I tried to download Spotify for Linux a few days ago and I made a small error and it caused a message which kept me from downloading Spotify. After 2 hours I realized the mistake and I was to download ...
ML_2898's user avatar