Hello,
I don’t want to create yet another SEGV_MAPPER thread so I associate myself to this one.
I tried all listed proposals and more, including : purging/reinstalling InSync, purging all lib-gl-u-1-mesa-dri-whatever packages, starting with the no-daemon mode, installing insync-beta instead of insync, starting with the LD_LIBRARY_PATH variable, and getting the same :
Cannot load library /usr/lib/insync/platformthemes/libqgtk3.so: (/usr/lib/x86_64-linux-gnu/libcairo.so.2: undefined symbol: FT_Get_Var_Design_Coordinates)
QLibraryPrivate::loadPlugin failed on "/usr/lib/insync/platformthemes/libqgtk3.so" : "Cannot load library /usr/lib/insync/platformthemes/libqgtk3.so: (/usr/lib/x86_64-linux-gnu/libcairo.so.2: undefined symbol: FT_Get_Var_Design_Coordinates)"
So I’m still stuck. Worked like a charm for a year at least so I reinstalled v1.4.9 to get I to work again. I wish @Kurt_Ko could bring us a nice solution soon.
Working on a Debian Buster - Linux 4.14.0-3-amd64 #1 SMP Debian 4.14.17-1 (2018-02-14) x86_64 GNU/Linux.