Selecting previously unselected package synergy.
(Reading database … 315650 files and directories currently installed.)
Preparing to unpack synergy_1.8.8-stable+dfsg.1-1build1_amd64.deb …
Unpacking synergy (1.8.8-stable+dfsg.1-1build1) …
dpkg: dependency problems prevent configuration of synergy:
synergy depends on libavahi-compat-libdnssd1 (>= 0.6.16); however:
Package libavahi-compat-libdnssd1 is not installed.
synergy depends on libqt4-network (>= 4:4.5.3); however:
Package libqt4-network is not installed.
synergy depends on libqtcore4 (>= 4:4.8.0); however:
Package libqtcore4 is not installed.
synergy depends on libqtgui4 (>= 4:4.8.0); however:
Package libqtgui4 is not installed.
dpkg: error processing package synergy (–install):
dependency problems - leaving unconfigured
Processing triggers for desktop-file-utils (0.24-1ubuntu3) …
Processing triggers for mime-support (3.64ubuntu1) …
Processing triggers for man-db (2.9.1-1) …
Errors were encountered while processing:
synergy
so i typed
sudo apt --fix-broken install
result:
Reading package lists… Done
Building dependency tree
Reading state information… Done
Correcting dependencies… Done
The following packages were automatically installed and are no longer required:
libqt5opengl5 linux-headers-5.4.0-42 linux-headers-5.4.0-42-generic linux-image-5.4.0-42-generic linux-modules-5.4.0-42-generic
linux-modules-extra-5.4.0-42-generic qtgstreamer-plugins-qt5
Use ‘sudo apt autoremove’ to remove them.
The following packages will be REMOVED:
synergy
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 4.071 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database … 315673 files and directories currently installed.)
Removing synergy (1.8.8-stable+dfsg.1-1build1) …
Processing triggers for mime-support (3.64ubuntu1) …
Processing triggers for man-db (2.9.1-1) …
Processing triggers for desktop-file-utils (0.24-1ubuntu3) …
The package, if maintained should have been ported to Qt5 (introduced 19-Dec-2012) before now.
–
FYI: I looked up on askubuntu & I do see PPAs or 3rd party repositories that contain some Qt4 packages for focal/20.04, but I’m not willing to provide those details as I can’t vouch for the source.
If there is a bug, it’s that the Synergy software coders are still using an EOL/depreciated toolkit/library (Qt4) that reached EOL in 2015. If you’d like to file a bug, please file it with Synergy (they had from 2012-2019 to switch to the upgraded Qt5, but either haven’t or you’re trying to install a depreciated package).
My added comment was a clue that I did see where people have packaged Qt4 for 20.04/focal, however PPAs are 3rd party software sources, so you need to know the person/group who packaged it to the extent that you can trust their work, know they are skilled & will maintain it, fixing security flaws etc. I don’t know the PPAs I saw, thus I won’t put my name to them (recommend or mention them). You can look for yourself & decide if you trust them (why I left the clues/breadcrumbs as to how they maybe found)
The best fix though is finding a supported program to achieve what you want. The synergy package you have appears to be unmaintained/abandoned & thus is it secure/trustworthy? or you’re trying to use an older un-patched package and thus should instead find a recent version using Qt5. My 2c/opinion
It seems the next step before following the Compile Steps section you need to do " Edit the Qt kit “Environment” field under Tools → Options → Build & Run → Kits and add BOOST_ROOT=/home/<user>/boost."
Again, if you need further help, we’re not the best resource. Contact Symless.
At the end, I’ve choose to use “Barrier”, a very similar software, but open source with a good community behind, where I’ve also found a way to override a big bug in it.
