Hi Qianqian Fang
There is no version 4.1.2.1-0~1788~ubuntu14.04.1 in the Ubuntu repository.
I think you have installed a version from a PPA.
I suggest disabling the PPA, uninstalling x2goclient, and then installing x2goclient 4.0.5.1-1ubuntu0.16.04.1 from the Ubuntu repository.
Hi Qianqian Fang 0~1788~ ubuntu14. 04.1 in the Ubuntu repository. 1ubuntu0. 16.04.1 from the Ubuntu repository.
There is no version 4.1.2.1-
I think you have installed a version from a PPA.
I suggest disabling the PPA, uninstalling x2goclient, and then installing x2goclient 4.0.5.1-