I just encountered this exact same scenario running Ubuntu Mate 19.04.
Software Updater believes all updates have been applied.  I get the pop-
up saying 19.10 is available, I click the Upgrade button, and the dialog
disappears and nothing happens.  Again, I drop to a command prompt:

root@ubuntu64:~# do-release-upgrade 
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.

root@ubuntu64:~# apt-get upgrade (following update)
The following packages were automatically installed and are no longer required:
  liblldb-8 llvm-8 llvm-8-dev llvm-8-runtime
Use 'apt autoremove' to remove them.
The following packages have been kept back:
  lldb
The following packages will be upgraded:
  gnome-shell gnome-shell-common

root@ubuntu64:~# do-release-upgrade 
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.

root@ubuntu64:~# apt-get purge lldb
Removing lldb (1:7.0-43ubuntu1) ...

And now  do-release-upgrade is proceeding.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/1799319

Title:
  Upgrade to 18.10 fails: Please install all available updates

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