can't define default browser after Buster upgrade

[kmchen]

Hi,

I recently did a complete Debian Buster reinstall over an old Strech install that had been upgraded since Sarge untill now.

The /home partition has not been touched during that reinstall and remains with old users data.

Now many problems happen with file associations.

"Open with Kview" before "Open with" appears in right clic menu on .png images but Kview doesn't exists anymore in Buster and clicking on those files rises error:

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KDEInit can't launch « kview »:
Cannot load library libkdeinit5_kview

Another bug is that I defined firefox as default browser in system default settings AND in thunderbird "network.protocol-handler.app.http" advanced settings but the system still opens links with chrome.

Any help greatly appreciated

[L_V]

What report this ?

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xdg-mime query default text/html

echo $BROWSER

sarge => jessie => stretch => buster ...
If you still use a very old user profile, it's really time to think about creating a brand new one.
+ your system is probably full of junk since sarge..... => faster to make a clean install

[kmchen]

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kmc@kmcs:~$ xdg-mime query default text/html
kfmclient_html.desktop
kmc@kmcs:~$ echo $BROWSER

kmc@kmcs:~$

What do you mean by "clean install" I did a complete new buster system install.

Do you mean also creating a new user and copying all my datas, loosing hundreds of KDE and environments settings since Sarge (perhaps older, I don't remember prehistoric names) ? Debian doesn't insure settings upgrade ?

[Head_on_a_Stick]

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echo $BROWSER

Debian uses the alternatives system to define the default browser so BROWSER should be unset in a stock system.

@OP: check

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ls -l /etc/alternatives/x-www-browser
update-alternatives --display x-www-browser

And also ~/.config/mimeapps.list

Xfce uses exo-preferred-applications to set the default browser.

[kmchen]

Finaly my default browser settings were taken in account. I don't know how (disconect/reconect probably ?)

And I solved the problem of bad file associations by editing the file ~/.local/share/applications/mimeapps.list, deleting bad lines in "Removed associations" section of that file.

Finally, editing mimeapps.list is more easy and efficient than using the silly Fille associations of system settings.

Hope this will help others that will encounter problems with file associations after Buster migration.

[L_V]

Do you mean also creating a new user and copying all my datas, loosing hundreds of KDE and environments settings since Sarge (perhaps older, I don't remember prehistoric names) ? Debian doesn't insure settings upgrade ?

Definitively yes ! Recommended. Mixing KDE3/4/5 settings over the time in a same profile is a very bad idea.
It is not a question of "Debian" upgrade, but KDE upgrades.
Many many things have changed since KDE3, and if you don't make some cleaning sometimes, be ready for next surprise.
For info kfmclient_html.desktop is from Konqueror package.

+ in KDE5, your mime setting / file association should be configurable here:

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kcmshell5 filetypes componentchooser