Upgrading from Linux Mint 20.3 to Linux Mint 21

[claude_andre]

Hi, I attempted to upgrade my Linux Mint 20.3 to Linux Mint 21. The process fails in the “Fixing check 'Foreign packages'”. I searched the web to see if there were some obvious issue(s) and how to address them (nothing helped). Here is the console output:
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Fixing check 'Foreign packages'

Code: Select all

DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt-get install --allow-downgrades -fyq -o Dpkg::Options::="--force-confold" -o Dpkg::Options::="--force-overwrite" fonts-opensymbol=2:102.11+LibO6.4.7-0ubuntu0.20.04.6 libharfbuzz-icu0=2.6.4-1ubuntu4.2 libharfbuzz0b=2.6.4-1ubuntu4.2 liblibreoffice-java=1:7.3.7-0ubuntu0.22.04.1~bpo20.04.1 libreoffice-style-colibre=1:6.4.7-0ubuntu0.20.04.6 libreoffice-style-yaru=1:7.3.7-0ubuntu0.22.04.1~bpo20.04.1 libuno-cppu3=1:6.4.7-0ubuntu0.20.04.6 libuno-cppuhelpergcc3-3=1:6.4.7-0ubuntu0.20.04.6 libuno-purpenvhelpergcc3-3=1:6.4.7-0ubuntu0.20.04.6 libuno-sal3=1:6.4.7-0ubuntu0.20.04.6 libuno-salhelpergcc3-3=1:6.4.7-0ubuntu0.20.04.6 libunoloader-java=1:6.4.7-0ubuntu0.20.04.6 uno-libs-private=1:6.4.7-0ubuntu0.20.04.6 ure=1:6.4.7-0ubuntu0.20.04.6 ure-java=1:7.3.7-0ubuntu0.22.04.1~bpo20.04.1
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 ure-java : Depends: uno-libs-private (= 1:7.3.7-0ubuntu0.22.04.1~bpo20.04.1) but 1:6.4.7-0ubuntu0.20.04.6 is to be installed
            Depends: ure (= 1:7.3.7-0ubuntu0.22.04.1~bpo20.04.1) but 1:6.4.7-0ubuntu0.20.04.6 is to be installed
            Breaks: ure (< 1:7.1.0~) but 1:6.4.7-0ubuntu0.20.04.6 is to be installed
E: Unable to correct problems, you have held broken packages.
Error - Return code: 100

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Any recommendations?
Thanks, Claude

[claude_andre]

In the absence of a reply I search the web and finally found a working solution:
> I removed The "libreoffice/ppa".
> Upgraded to Linux 21 and rebooted .
> Then issued: "add-apt-repository ppa:libreoffice/ppa" and "apt install libreoffice"
I am not sure how to close this post.

[Moem]

Well done on finding a solution and posting it here! My signature will tell you how to close the post.