lsmod

The problem could be solved now be deinstalling skylendar-4.2nn-1-x86_64.deb and installing the package skylendar-4.1.2nn-1-linuxmint-x86_64.deb The package for Linux Mint runs in Debian Buster (stable).

It seems more to be the correct glibc the problem? skylendar: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by /usr/local/lib64/libskyldr.so.4) skylendar: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.12' not found (required by /usr/local/lib64/libskyldr.so.4) Or is the problem that Qt_5.12 is needed instead of 5.11 ? # ldd /usr/local/lib64/libskyldr.so.4 /usr/local/lib64/libskyldr.so.4: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required...

It seems more to be the correct glibc the problem. skylendar: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by /usr/local/lib64/libskyldr.so.4) skylendar: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.12' not found (required by /usr/local/lib64/libskyldr.so.4) Is the problem that Qt_5.12 is needed instead of 5.11 ? # ldd /usr/local/lib64/libskyldr.so.4 /usr/local/lib64/libskyldr.so.4: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required...

Thanks for the quick response. QT5 seems to be installed. There are plenty of packages: ii kde-style-oxygen-qt5 4:5.14.5-1 amd64 Qt decoration for the Oxygen desktop theme ii kde-style-qtcurve-qt5:amd64 1.9-2+b2 amd64 QtCurve widget style for applications based on Qt 5.x ii libaccounts-qt5-1 1.15-2 amd64 Accounts database access Qt version - Qt5 shared library ii libdbusmenu-qt5-2:amd64 0.9.3+16.04.20160218-1 amd64 Qt implementation of the DBusMenu protocol ii libmarblewidget-qt5-28 4:17.08.3-3.2...

Thanks for the quick response. QT5 seems to be installed. There are plenty of packages: ii kde-style-oxygen-qt5 4:5.14.5-1 amd64 Qt decoration for the Oxygen desktop theme ii kde-style-qtcurve-qt5:amd64 1.9-2+b2 amd64 QtCurve widget style for applications based on Qt 5.x ii libaccounts-qt5-1 1.15-2 amd64 Accounts database access Qt version - Qt5 shared library ii libdbusmenu-qt5-2:amd64 0.9.3+16.04.20160218-1 amd64 Qt implementation of the DBusMenu protocol ii libmarblewidget-qt5-28 4:17.08.3-3.2...

Thanks for the quick response. QT5 seems to be installed. There are plenty of packages: ii kde-style-oxygen-qt5 4:5.14.5-1 amd64 Qt decoration for the Oxygen desktop theme ii kde-style-qtcurve-qt5:amd64 1.9-2+b2 amd64 QtCurve widget style for applications based on Qt 5.x ii libaccounts-qt5-1 1.15-2 amd64 Accounts database access Qt version - Qt5 shared library ii libdbusmenu-qt5-2:amd64 0.9.3+16.04.20160218-1 amd64 Qt implementation of the DBusMenu protocol ii libmarblewidget-qt5-28 4:17.08.3-3.2...

Skylendar does not start in Debian 10

Ah - then we come closer to the problem, because i have no tabs. Then the reason is an incompatibility of Thunderbird 60.4.0 with the libraries of Debian 8. There is already an open bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916443 I will check this in Debian 9 - but i think it will work there.