Fixed update-manager is stuck in phasing because it triggered old bugs like LP: #1791931 with the removals.
If you run sudo apt-get install update-manager to bypass phasing it will remove the old kernels which are not marked manually installed.
Fixed update-manager is stuck in phasing because it triggered old bugs like LP: #1791931 with the removals.
If you run sudo apt-get install update-manager to bypass phasing it will remove the old kernels which are not marked manually installed.