Software updater warning: requires installation of untrusted packages

Question

I am using Ubuntu 15.04 and when I try update for Software updater I always get this error:

enter image description here

I also tried to not download some packages and download the main ones but the error always stays there.

score 25 · Accepted Answer · answered Jun 11 '15 at 09:03

25

This is some problem in yout cache run those commands to solve it:

sudo apt-get clean
sudo mv /var/lib/apt/lists /var/lib/apt/lists.bak
sudo mkdir -p /var/lib/apt/lists/partial
sudo apt-get clean 
sudo apt-get update

answered Jun 11 '15 at 09:03

Maythux

I can confirm this works! Why doesn't @Maythux have more up-votes? :) After running the final apt-get update, I re-opened the Software Updater and proceeded normally. – blong Aug 08 '16 at 14:19
Worked beautifully in my Ubuntu 16.04. Thanks a ton @Maythux.. – Rohan_Paul Dec 03 '16 at 09:50
1

I still get the same error – bademba Aug 24 '17 at 14:02

Akshay Pratap Singh · Answer 2 · 2017-03-28T13:20:22.650

21

I had the same problem. This happens due to the missing of some GPG keys.

Go to applications->accessories->terminal or press CTRL+ALT+T.

And, type below commands:-

sudo apt-get update --fix-missing

You will get an error saying that some public key is not available. Note the key string ( after the NO_PUBKEY; eg:3C962022012520A0 )

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com XXXXXX

Replace the XXXXXX with the key string

Ex:- sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3C962022012520A0

Now try updating your system again.

sudo apt-get update

This will surely solve this issue.

edited Mar 28 '17 at 13:20

answered Jun 11 '15 at 10:57

After executing sudo apt-get update --fix-missing I had an error messages GPG error: http://www.rabbitmq.com/debian testing InRelease: The following signatures couldn't be verified because the public key is not available. Adding public key for rabbitmq repo fixed the issue. – Jekis Mar 26 '17 at 05:24
@jekis have you try another method mentioned in my answer ? – Akshay Pratap Singh Mar 26 '17 at 19:32
1

I just wanted to say that your suggestion pointed me to the real problem on my computer. And the whole update issue has been resolved after adding the rabbitmq public key. – Jekis Mar 27 '17 at 09:07
@Jekis if your issue is fixed by this method, i think then it needs one upvote. This will help other persons, in getting the right answer to solve this issue. – Akshay Pratap Singh Mar 28 '17 at 13:14

2 Answers2