[SOLVED] Missing library libQtNetwork.so.4

[Hansl]

Another of the many little troubles installing LMDE3 and to get the previus setups running again… The nice little intranet LAN messenger BeeBeep is built using Qt4, needing several libs. http://beebeep.sourceforge.net/

On LMDE2 I did —

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apt install libqt4-dev libqt4-core libqt4-gui libqt4-xml libxcb-screensaver0 libavahi-compat-libdnssd1 libphonon4 libhunspell-dev phonon-backend-gstreamer

and it worked.

LMDE3 / Debian Stretch embraces Qt5, many of the above are not available any more. I tried —

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apt install libqt5core5a libqt5gui5 libqt5widgets5 libqt5network5 libqt5printsupport5 libqt5multimedia5 libqt5multimedia5-plugins libxcb-screensaver0 libavahi-compat-libdnssd1 libphonon4 libhunspell-dev phonon-backend-gstreamer

but it is not enough: BeeBeep complains about a missing libQtNetwork.so.4 (maybe more after that).
Funnily, I can't find libQtNetwork.so.4 even in the older Debian repos… where did I get it then?
And what do I do now? Certainly, I could copy it from my backups, but would that be safe?

[Monsta]

Looks like it's still available.

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$ apt-file search libQtNetwork.so.4
libqt4-network: /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
libqt4-network: /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4.8
libqt4-network: /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4.8.7

[Hansl]

Ah, Monsta to the rescue again — thanks a lot! Didn't think of apt-file.

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apt install libqt4-network

did the trick, BeeBeep is now up and running.
Funnily, that search returns no results on another LMDE2 system although libqt4-network is installed there…

[Monsta]

I recall that in older versions you needed to update the file index first...

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sudo apt-file update

Also if you need to search only through the installed packages, Mint's apt script can do it too:

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$ apt contains libQtNetwork.so.4
libqt4-network:amd64: /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
libqt4-network:amd64: /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4.8
libqt4-network:amd64: /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4.8.7

It uses dpkg for that:

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$ apt help contains
"apt contains " is equivalent to "dpkg -S "

The difference is that apt-file searches in all packages, not only the installed ones.

[Hansl]

Yes, in LMDE2 an apt-file update was needed, I see now. Thanks again!