I am trying to upgrade Ubuntu.
sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo do-release-upgrade
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.
There is one package remaining which needs to be updated:
r-base-dev/bionic-cran40 4.4.2-1.1804.0 all [upgradable from: 4.3.0-1.1804.0]
N: There are 28 additional versions. Please use the '-a' switch to see them.
sudo apt install r-base-dev=4.4.2-1.1804.0
Reading package lists... Done
Building dependency tree
Reading state information... Done
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:
r-base-dev : Depends: libdeflate-dev but it is not installable
E: Unable to correct problems, you have held broken packages.
I try to install libdeflate-dev, but not possible:
sudo apt install libdeflate-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libdeflate-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'libdeflate-dev' has no installation candidate
Also trying to use the software updater by pressing 'upgrade'is not helping since it does nothing then.
I would be very thankful for ideas and help!
