Not sure if the right area to post but I have a solution to GDebi not working when opened via .deb file association:

[0x6A7232]

If I open GDebi, then manually open the .deb file I want to install, it will prompt me for my password for sudo and work correctly.
If I open the .deb from the browser download list or the file manager, GDebi will open, but when hitting install it will instantly close.

To fix, edit

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/usr/share/applications/gdebi.desktop

Find the line

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Exec=gdebi-gtk %f

change it to add gksudo:

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Exec=gksudo gdebi-gtk %f

Save the file You might need sudo to save it, if this is a problem (your text editor doesn't prompt you for sudo but instead fails), precede your text editor with sudo in terminal, example:

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sudo featherpad /usr/share/applications/gdebi.desktop

Hopefully this can be patched in the future but in the meantime, changing that line will fix the problem, at least it did perfectly for me.

[0x6A7232]

Figured out how to report bugs to Debian (installed the

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reportbug

package). Reported there, hopefully it gets resolved one way or another.

[AVLinux]

Hi,

This solution will only work until there is an update to Gdebi then the package manager will overwrite your edits with a new file and break it again..

Gdebi has been broken ever since Debian changed how 'su' worked quite some time ago and since it's been broken that long nobody upstream appears very interested in fixing it... MX Linux provides two other methods (a) a right-click Thunar Custom Action in the MX XFCE4 version and their own native 'Deb-Installer' which does what Gdebi does and more.. Are both of these options not preferable to an installer that has been broken for at least 2 major Debian releases?

[Stevo]

sudo featherpad /usr/share/applications/gdebi.desktop

Featherpad also has a feature where one can edit a system file, and then only ask for the password if the changes are saved.

[FraterLinux]

To fix, edit

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/usr/share/applications/gdebi.desktop

Find the line

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Exec=gdebi-gtk %f

A simpler solution:

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Exec=sh -c "gdebi-gtk %f"