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I am upgrading from 18.04 to 20.04. I have updated 18.04. When I run:

$ sudo apt list --upgradable -a
Listing... Done
xscreensaver-data-extra/bionic 5.36-1ubuntu1 amd64 [upgradable from: 5.34-2ubuntu1]
xscreensaver-data-extra/now 5.34-2ubuntu1 amd64 [installed,upgradable to: 5.36-1ubuntu1]

If I then run sudo update-manager I get a window that says:The software on this computer is up to date. However, Ubuntu 20.04 is now available(you have 18.04). When I click the Upgrade window I get: Please install all available updates for your release before upgrading. What do I need to do to complete the upgrade process?

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  • Run sudo apt update;sudo apt upgrade and resolve any errors. – waltinator May 4 at 21:36
  • I'd suggest sudo apt full-upgrade & always check you didn't put holds on any packages (apt-mark showhold), and read your sudo apt update lines to ensure you're not missing any lines (ie. later packages aren't being detected because of flaws in your sources; and what 3rd party sources are there as they can cause problems) – guiverc May 4 at 22:31
  • $ sudo apt full-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages have been kept back: xscreensaver-data-extra 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. – Paul Miller May 5 at 23:41
  • How do I get past this problem? $ sudo apt full-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages have been kept back: xscreensaver-data-extra 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. Is xscreensaver-data-extra my problem? – Paul Miller May 5 at 23:42
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Take this link steps on official Ubuntu blog: How to upgrade from Ubuntu 18.04 LTS to 20.04 LTS today

before starting the update, run this commands:

sudo apt update
sudo apt upgrade

if didn't work, try these:

sudo apt update -y
sudo apt upgrade -y

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