more information:
After I install package xserver-xorg-input-mouse, I got another error message. If I run optirun, the error message is: $ optirun glxgears [ 502.952517] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) [ 502.952549] [ERROR]Aborting because fallback start is disabled. if I run primusrun, the error message is: $ primusrun glxgears /usr/bin/primusrun: line 41: warning: command substitution: ignored null byte in input primus: fatal: Bumblebee daemon reported: error: [XORG] (EE) Best regards, Gulfstream
