Software Update won't install version 21.04

[Tony Pursell]

Every time my system installs new software it tells me that a new version (21.04) of Ubuntu is available to update from my current version 20.10.

There is a Upgrade button for me to press. I expect it to call the Upgrade routine to install version 21.04.

Instead, nothing happens.

[Tony Pursell (ajpursell)]

running the commands:

apt-get update
apt-get upgrade
apt-get dist-upgrade

also do not upgrade to 21.04.

The last two commands report that dh-python has been kept back.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1936669/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Brian Murray (brian-murray)]

What happens if you run 'do-release-upgrade' in a terminal?

[Tony Pursell (ajpursell)]

Thanks for your message Brian.

do-release-upgrade reports:

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

Then returns to the prompt.

If I then run

apt-get update
apt-get upgrade
apt-get dist-upgrade

I get nothing except the message that dh-python is being kept back.

[Brian Murray (brian-murray)]

What does apt-cache policy dh-python show?

[Tony Pursell (ajpursell)]

It shows:

dh-python:
  Installed: 4.20191017ubuntu7
  Candidate: 4.20200925
  Version table:
     4.20200925 500
        500 http://gb.archive.ubuntu.com/ubuntu groovy/universe amd64 Packages
        500 http://gb.archive.ubuntu.com/ubuntu groovy/universe i386 Packages
 *** 4.20191017ubuntu7 100
        100 /var/lib/dpkg/status

[Tony Pursell (ajpursell)]

I ran

apt-get install dh-python

this removed

python-is-python2

and upgraded

dh-python

apt-cache policy dh-python now shows

dh-python:
  Installed: 4.20200925
  Candidate: 4.20200925
  Version table:
 *** 4.20200925 500
        500 http://gb.archive.ubuntu.com/ubuntu groovy/universe amd64 Packages
        500 http://gb.archive.ubuntu.com/ubuntu groovy/universe i386 Packages
        100 /var/lib/dpkg/status

When I can, I will now see if I can upgrade to 21.04

[Tony Pursell (ajpursell)]

I ran

apt-get install dh-python

this removed

python-is-python2

and upgraded

dh-python

apt-cache policy dh-python now shows

dh-python:
  Installed: 4.20200925
  Candidate: 4.20200925
  Version table:
 *** 4.20200925 500
        500 http://gb.archive.ubuntu.com/ubuntu groovy/universe amd64 Packages
        500 http://gb.archive.ubuntu.com/ubuntu groovy/universe i386 Packages
        100 /var/lib/dpkg/status

I then used

apt-get install python

and was told to install python-is-python2, which I did.

This removed dh-python.

I will now try to upgrade to 21.04, when I can

[Tony Pursell (ajpursell)]

I have now upgraded to 21.04, and all seems OK.