An an updated CentOS 7.9 system (has the latest packages installed), after I chmod +x the Nextcloud-3.1.0-x86_64.Appimage file and execute it, I get:
/usr/bin/AppImageLauncher: /lib64/libstdc++.so.6: version GLIBCXX_3.4.21' not found (required by /usr/bin/AppImageLauncher) /usr/bin/AppImageLauncher: /lib64/libc.so.6: version GLIBC_2.22’ not found (required by /usr/bin/…/lib/x86_64-linux-gnu/appimagelauncher/libappimageupdate.so)
/usr/bin/AppImageLauncher: /lib64/libstdc++.so.6: version GLIBCXX_3.4.20' not found (required by /usr/bin/../lib/x86_64-linux-gnu/appimagelauncher/libappimageupdate.so) /usr/bin/AppImageLauncher: /lib64/libstdc++.so.6: version GLIBCXX_3.4.21’ not found (required by /usr/bin/…/lib/x86_64-linux-gnu/appimagelauncher/libappimageupdate.so)
/usr/bin/AppImageLauncher: /lib64/libcurl.so.4: no version information available (required by /usr/bin/…/lib/x86_64-linux-gnu/appimagelauncher/libappimageupdate.so)
/usr/bin/AppImageLauncher: /lib64/libstdc++.so.6: version GLIBCXX_3.4.20' not found (required by /usr/bin/../lib/x86_64-linux-gnu/appimagelauncher/libappimage.so.1.0) /usr/bin/AppImageLauncher: /lib64/libstdc++.so.6: version GLIBCXX_3.4.21’ not found (required by /usr/bin/…/lib/x86_64-linux-gnu/appimagelauncher/libappimage.so.1.0)
Is this a bug or is there some software required in order to run the Linux client for CentOS 7.9?