[RESOLVED] Qapt failing with segfault

[oshunluvr]

Everytime I attempt to install a deb file, Qapt fails with this:

[Fri Jan 30 14:58:48 2026] qapt-deb-instal[3264043]: segfault at 0 ip 0000785b107d441b sp 00007ffe72477c20 error 4 in libKF5ConfigCore.so.5.116.0[4141b,785b107ad000+40000] likely on CPU 2 (core 2, socket 0)
[Fri Jan 30 14:58:48 2026] Code: 48 89 bd 58 ff ff ff 48 89 b5 48 ff ff ff 89 8d 54 ff ff ff 64 48 8b 04 25 28 00 00 00 48 89 45 c8 31 c0 48 89 95 78 ff ff ff <8b> 02 83 c0 01 83 f8 010f 87 17 03 00 00 e8 42 07 00 00 48 89 85​

Anyone else seeing this?

[Snowhog]

install a deb file

How? CLI? Package Manager? Or....

[oshunluvr]

Dolphin sub menu that runss qapt

[claydoh]

Can I ask why are you using qapt? I don't think it has been part of a neon install for ages, if it ever was.
My guess is that this old and now dead software is qt5, and doesn't like the updated qt5 bits neon provides over the stock Kubuntu ones.

$ apt policy libkf5configcore5
libkf5configcore5:
Installed: 5.116.0-1zneon+24.04+noble+release+build3
Candidate: 5.116.0-1zneon+24.04+noble+release+build3
Version table:
*** 5.116.0-1zneon+24.04+noble+release+build3 500 <---------------------------------------
            500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
            100 /var/lib/dpkg/status
5.116.0-1xzneon+24.04+noble+release+build2 500
            500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
5.116.0-1xzneon+24.04+noble+release+build1 500
            500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
5.116.0-1xxneon+24.04+noble+release+build4 500
           500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
5.115.0-0ubuntu5 500 <----------------------------------------------------------------------------------
           500 [URL]http://archive.ubuntu.com/ubuntu[/URL] noble/universe amd64 Packages

[oshunluvr]

Can I ask why are you using qapt? I don't think it has been part of a neon install for ages, if it ever was.
My guess is that this old and now dead software is qt5, and doesn't like the updated qt5 bits neon provides over the stock Kubuntu ones.

$ apt policy libkf5configcore5
libkf5configcore5:
Installed: 5.116.0-1zneon+24.04+noble+release+build3
Candidate: 5.116.0-1zneon+24.04+noble+release+build3
Version table:
*** 5.116.0-1zneon+24.04+noble+release+build3 500 <---------------------------------------
500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
100 /var/lib/dpkg/status
5.116.0-1xzneon+24.04+noble+release+build2 500
500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
5.116.0-1xzneon+24.04+noble+release+build1 500
500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
5.116.0-1xxneon+24.04+noble+release+build4 500
500 [URL]http://archive.neon.kde.org/user[/URL] noble/main amd64 Packages
5.115.0-0ubuntu5 500 <----------------------------------------------------------------------------------
500 [URL]http://archive.ubuntu.com/ubuntu[/URL] noble/universe amd64 Packages

Alternatives?

I just want to be able to click on a deb package and install it within Dolphin

[claydoh]

Alternatives?

Discover.

[oshunluvr]

Ok, removing qapt put Discover in the list of applications to open a deb file, so thanks. Not sure why it didn't appear before. I don't really use Discover so that hadn't occurred to me.