Bálint Réczey writes:
> Hi Olaf,
>
> 2016-01-15 5:51 GMT+01:00 Olaf Meeuwissen <olaf.meeuwis...@avasys.jp>:
>> Package: wireshark-qt
>> Version: 2.0.0+g9a73b82-1
>> Severity: grave
>>
>> Dear Maintainer,
>>
>> I tried starting wireshark from the comman-line and it immediately
>> aborted. Like so:
>>
>> $ wireshark
>> This application failed to start because it could not find or load the Qt
>> platform plugin "xcb".
>>
>> Available platform plugins are: linuxfb, minimal, minimalegl, offscreen.
>>
>> Reinstalling the application may fix this problem.
>> Aborted
>>
>> I had expected it to start like it used to do. I don't recall when I
>> last used it. I keep my system up-to-date with unattended-upgrades and
>> my logs indicate wireshark-qt was installed on 2015-12-01 with the
>> upgrade of wireshark from 1.12.8+g5b6e543-2 to 2.0.0+g9a73b82-1. I do
>> remember being surprised at the changed look-and-feel of wireshark, so I
>> am pretty sure that I have run wireshark-qt successfully in the past.
> Please install libqt5xcbqpa5 to let it run again.
>
> I suspect you installed wireshark/libqt5gui5 with --no-install-recommends,
> since libqt5gui5 recommends libqt5xcbqpa5:
Almost, I ran unattended-upgrade and my apt.conf has
APT::Install-Recommends "false";
Apt::AutoRemove::RecommendsImportant "false";
Unattended-Upgrade::Remove-Unused-Dependencies "true";
> Package: libqt5gui5
> Source: qtbase-opensource-src
> Version: 5.5.1+dfsg-12
> Installed-Size: 7096
> Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
> Architecture: amd64
> ...
> Recommends: libqt5svg5, libqt5xcbqpa5
>
> --no-install-recommends may cause parts of functionality not available
> in packages.
Well, in this case *all* of the functionality was not available. The
wireshark executable is the only thing in /usr/bin/ of wireshark-qt.
> It that was the case, please close the bug since the default behavior
> of installing all
> needed packages for proper operation was overridden.
I think we have different opinions on what is "needed" for proper
operation. From Debian Policy, section 7.2 under `Depends`:
The `Depends` field should be used if the depended-on package is
required for the depending package to provide a significant amount
of functionality.
I would argue that showing the GUI is a prerequisite for any of the
functionality. The GUI isn't shown, hence, zero functionality.
I don't know how wireshark-qt obtained the dependency but it needs that
xcb plugin very badly to provide any functionality. Can't you add the
libqt5xcbqpa5 dependency to wireshark-qt (even if only temporarily)?
BTW, now that I found out that there is a wireshark-gtk package as well
I will replace wireshark-qt with that. It'll fit in better on my Xfce4
desktop.
Hope this helps,
--
Olaf Meeuwissen, LPIC-2 FLOSS Engineer -- EPSON AVASYS CORPORATION
Free Software Foundation Associate Member since 2004-01-27
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