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I decided to upgrade

sudo update-manager -d

Then it's opening the update-manger GUI. After clicking the upgrade button It's return the below error list:

W:There is no public key available for the following key IDs: 3B4FE6ACC0B21F32,
W:There is no public key available for the following key IDs: 3B4FE6ACC0B21F32,
E:Some index files failed to download. They have been ignored, or old ones used instead.

How to resolve this issue?

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This warning means that you don't have the corresponding public keys for these repositories.

W:There is no public key available for the following key IDs: 3B4FE6ACC0B21F32,
W:There is no public key available for the following key IDs: 3B4FE6ACC0B21F32,

Verify that these keys are indeed the ones you need. In this case:

➜  ~ gpg --keyserver hkp://keyserver.ubuntu.com --search-key 3B4FE6ACC0B21F32
gpg: searching for "3B4FE6ACC0B21F32" from hkp server keyserver.ubuntu.com
(1) Ubuntu Archive Automatic Signing Key (2012) <[email protected]>
      4096 bit RSA key C0B21F32, created: 2012-05-11
Keys 1-1 of 1 for "3B4FE6ACC0B21F32".  Enter number(s), N)ext, or Q)uit >

The ID correspond to Ubuntu Archive. It is strange that you are missing these keys. This is normally fixed with:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32

After this, run sudo apt-get update and make sure no other warnings/errors appear.

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  • 1
    Master answer. I hope this does not indicate funny business or vulnerability on the server.
    – tread
    Jun 20, 2016 at 9:36
  • In my case, it was simply a 3rd party repository whose public key had expired. The above steps installed the new public key, and my apt-get update subsequently was squeaky clean.
    – Craig Constantine
    Oct 8, 2016 at 14:11

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