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I found that gdm3 has vulnerabilities: https://lists.ubuntu.com/archives/ubuntu-security-announce/2018-August/004530.html

but I'm not able to update gdm3 to the version 3.28.2-0ubuntu1.4:

sudo apt-get --only-upgrade install gdm3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gdm3 is already the newest version (3.28.0-0ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I tried to remove gdm3 and fresh install but it still installs in version 3.28.0.

There is any way I can update gdm3 package? My Linux is Ubuntu 18.04.

Mariusz Jucha
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    Hi Mariusz! Welcome to AskUbuntu! Have you done an sudo apt update before you called apt-get? https://packages.ubuntu.com/bionic/gdm3 3.28.3 is in the security repository so it should update but you need to update the index with sudo apt update first. – tudor -Reinstate Monica- Aug 19 '21 at 14:09
  • Yes, I've already done sudo apt update. There was many hints and warning but I don't know what they mean. After all there were info All packages are up to date. so I guess everything is up to date. Maybe I'm missing some of the repositories? – Mariusz Jucha Aug 19 '21 at 14:15
  • If it's a fresh install, the security repos should already be enabled. Maybe check the contents of /etc/apt/sources.list and make sure there's bionic-security on the line of each repos. Something like this: deb-src http://archive.ubuntu.com/pub/ubuntu/ubuntu/ bionic-security main .... – tudor -Reinstate Monica- Aug 19 '21 at 14:25
  • Post the output of sudo apt update, please. Are you on a Raspberry Pi or something? https://packages.ubuntu.com/bionic/gdm3 says the newest version for ARM systems is indeed 3.28.0-0ubuntu1 – muru Aug 19 '21 at 14:32
  • It is no clean install. I've added deb-src http://archive.ubuntu.com/pub/ubuntu/ubuntu/ bionic-security main because I did not found bionic-security repository but after sudo apt-get update I'm getting Err:11 http://archive.ubuntu.com/pub/ubuntu/ubuntu bionic-security Release 404 Not Found [IP: 91.189.88.152 80] – Mariusz Jucha Aug 19 '21 at 14:34
  • Edit your question and include the full output of sudo apt update if you are getting lots of warnings, you should not do anything else in apt until you sort out your problems with your package manager. Otherwise, you're likely to cause new problems. – Nmath Aug 19 '21 at 16:36

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