Mendeley linux download link: https://www.mendeley.com/download-mendeley-desktop-legacy/linux , I downloaded Download for Ubuntu and Kubuntu 16.04 LTS, 17.04 and Debian Stretch 9this version, and the link to its 64-bit installation file is here .
The reason why mendeley cannot input Chinese (Sogou input method) is that the mendeley installation package does not contain plug-ins that support fcitx input , and you need to put the appropriate libfcitxplatforminputcontextplugin.sofiles into the mendeley installation directory.
For versions before ubuntu 19 and after ubuntu 20, the solutions are slightly different.
Ubuntu 19 and before
Directly copy the original plug-in in the system directory to the mendeley plug-in directory
sudo cp /usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libfcitxplatforminputcontextplugin.so /opt/mendeleydesktop/plugins/qt/plugins/platforminputcontexts/
ubuntu 20 and later
You need to download the file in this linklibfcitxplatforminputcontextplugin.so.for.MendeleyDesktop , rename it libfcitxplatforminputcontextplugin.so, and copy it to the mendeley plugin directory ( /opt/mendeleydesktop/plugins/qt/plugins/platforminputcontexts/).
Reference blog: https://www.cnblogs.com/ArrowKeys/p/13252299.html