File manager disappeared when upgrading from 20.04 to 22.04

Ubuntu Version: 22.04.5 LTS

Desktop Environment (if applicable):

Problem Description:
I am trying to update a Lubuntu system (a cheap AMD-based ASUS Vivobook) that was running 20.04. So the first step was to install 22.04. The upgrade process went on smoothly and the logon screen came up, but then I got white noise on the laptop screen. After some googling, it seems that kernel had some hardware issues, and I installed the HWE stack.

Now I can login but the wallpaper and the desktop icons have disappeared. While trying to bring them back up, I noticed that File Manager had disappeared. If I right-click on the desktop I get a “Shortcuts” menu which has “File Manager”, but if I click it, I get a message box from Openbox which says “Failed to execute child process “lxsession-default” (No such file or directory)”

If I try apt install pcmanfm-qt, I get message that says that the package pcmanfm-qt isn’t available but another package references it…

Mind you, my goal is to upgrade to 24.04, but I’d rather start the new upgrade from a stable and complete system.

Relevant System Information:

Screenshots or Error Messages:

What I’ve Tried:


It appears that your in-situ upgrade from Lubuntu 20.04 to Lubuntu 22.04 did not go as anticipated.
Of course, Lubuntu 20.04 reached EOL (end of life) in April 2023.
Therefore, the upgrade path is more complicated.
EOL Upgrades

The foolproof way:-

  • Backup your personal data
  • Download Lubuntu 24.04
  • Make a bootable installation USB
  • Try Lubuntu
  • If happy, install Lubuntu
  • Upgrade packages
  • Restore your data

Happiness is just a couple of hours away :wink:

1 Like

Yes, it sounds sensible. There’s not much data on the computer anyway. It’s more about the customization I had done for that particular user, which was five years ago and I don’t remember exactly how I did it.

But yes, it will be easier to replicate that than figuring out what went wrong.

Thank you

Well, have you tried to simply install the lubuntu-desktop task ? That should bring all desktop session related packages back…

sudo apt install lubuntu-desktop^

(Note the caret at the end of the line, that tells apt to use the task and not just the meta package)

I have just tried, but it complains about unmet dependencies with libreoffice-qt5, which isn’t even installed. I have tried to uninstall libreoffice, which isn’t really needed, but it keeps complaining.

I don’t know, maybe it’s the HWE kernel. I’m running 6.8.0-59 but all the packages must be for kernel 5.

Thanks for your interest.