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When trying to upgrade 19.10 to 20.04 with "update-manager -c -d" the software updater tells me the software is up to date and there is a new release available but when I select upgrade I get the message "Checking for a new Ubuntu release Please install all available updates for your release before upgrading." How do I overcome this?

The issue appears to be related to lldb. Both answers give the same result. Here is an example:

sudo apt dist-upgrade -y

Reading package lists... Done Building dependency tree
Reading state information... Done Calculating upgrade... Done The following packages have been kept back: lldb 0 to upgrade, 0 to newly install, 0 to remove and 1 not to upgrade.

update-manager -c -d

Checking for a new Ubuntu release Please install all available updates for your release before upgrading.

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    sudo apt update and sudo apt upgrade before trying to release-upgrade. The message is saying that your 19.10 is not quite up-to-date. – user535733 May 5 '20 at 22:59
  • DANGER DANGER... if you use the -d option, you'll get the development version. @user535733 has the correct answer to your specific question. – heynnema May 6 '20 at 0:52
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Open terminal and run

sudo apt update
sudo apt install -f
sudo apt dist-upgrade -y

and try to upgrade 19.10 to 20.04 with

update-manager -c -d
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  • The issue here was that lldb was reported as being "kept back". once I forced an update with "sudo apt-get install lldb" all seemed to work – Terry Dixon May 9 '20 at 22:07

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