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I was attempting to install some Kali linux tools onto my computer running Ubuntu 16.04 using katoolin, and the majority of it worked out and installed properly, but when I tried to upgrade it an error came up. Eventually after some tinkering, the available updates from katoolin disappeared. Now when I boot Ubuntu does not even show up as Ubuntu, it says Kali Linux on the GRUB menu instead. I am not sure how to go about attempting to solve any of these problems as I am pretty new to Linux, so I was hoping someone out there could help.

Also, as of now GNOME is not loading, so I am at the stage of using a virtual console (I got there by pressing Ctrl+Alt+F1).

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  1. All actions with apt are logged. These files are available in /var/log/apt/. To view the most recent history log run:

    less /var/log/apt/history.log  
    

    This will show you the changes that you made installing Katoolin and Kali linux tools.

  2. Copy these changes from /var/log/apt/history.log into a text file and save the file.

  3. Undo all the changes that you made since installing Katoolin one by one. Take your time and check your work as you go to avoid making typing errors.

  4. Remove Katoolin.

    sudo rm -r /usr/bin/katoolin
    
  5. Important! Look in your software sources for any repositories added by Katoolin and remove these repositories from your software sources. You are going to be reinstalling the Ubuntu desktop system in step 7, and if you don't remove all the software sources that were added by Katoolin it may interfere with step 7.

    Check what software sources have been added by Katoolin.

    cat /etc/apt/sources.list | grep kali
    

    If you see a kali software source, remove its deb and deb-src from sources.list and then save the file.

    Finish by manually checking your software sources in /etc/apt/sources.list and from the Dash by clicking on Software & Updates to open a Software & Updates window -> Other Software tab to make sure that you removed all the software sources that were added by Katoolin.

  6. Update the list of available software.

    sudo apt update
    
  7. If you are using Ubuntu, finish by reinstalling the Ubuntu desktop system.

    sudo apt-cache depends ubuntu-desktop | grep '[ |]Depends: [^<]' | cut -d: -f2 | tr -d ' ' | xargs sudo apt-get --reinstall install -y
    
  8. Install grub to the MBR of your boot drive with these commands:

    sudo apt-get --reinstall install base-files/xenial-updates && sudo reboot  
    sudo os-prober  
    sudo update-grub      
    
  9. When you have completed these steps, you may reboot the computer.

    sudo reboot  
    

Before installing katoolin again read the last section of this answer for advice about how to prevent the same problem from reoccurring.

  • I think it goes deeper than the desktop. If grub is reporting kali, I think his core system has been updated to kali. – ravery Mar 23 '18 at 4:20
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    @ravery katoolin frequently causes this error in the GRUB menu. His core system has not been updated to Kali, only the entry in the GRUB menu has been superficially changed from Ubuntu to Kali as indicated in step 8 of this answer and also in this answer: askubuntu.com/questions/836270/… – karel Mar 23 '18 at 4:24
  • ubuntu-desktop is just a lowly meta-package so apt install --reinstall won't do anything more than a plain install would. There's an another answer for reinstalling dependencies. – Oli Mar 23 '18 at 10:11
  • How would I go about undoing all of the upgrades. I was thinking about using the purge command, which I found online, but then I would have to type all 900 packages out individually because I cant do anything but type. Is there a simple way to undo all of the things I did. All of it was just me upgrading using apt-get upgrade and me using autoremove. I am assuming all I need to do is undo the upgrading parts. I feel like there is a smarter way to do it. I can only get to the console (I think that is what its called, I got there using ctrl alt f1), no gui, so what can I do? Thanks for the ans.! – Kaushik Mar 24 '18 at 0:40
  • katoolin also installs packages from GitHub. Removing multiple packages that were installed from GitHub will be a lot of hard work. Finding and removing orphaned packages (with deborphan) left over after removing packages that were quickly uninstalled with apt is even more hard work, and can also break your system if not done slowly and carefully. Fortunately it is not necessary to use deborphan. – karel Mar 24 '18 at 1:19

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