gdm的错误

freethirsty

近来开机后启动X时nvidia的logo图标和gdm界面先闪一次后要再闪一次才停住，查看.xsession-errors，有如下内容
/opt/gnome/etc/gdm/Xsession:
ssh-agent not found!/opt/gnome/etc/gdm/PreSession/Default:
Registering your session with wtmp and utmp
/opt/gnome/etc/gdm/PreSession/Default: running: /usr/bin/sessreg -a -w /var/log$
/opt/gnome/etc/gdm/Xsession: Beginning session setup...
/opt/gnome/etc/gdm/Xsession: ssh-agent not found!
这问该如何解决？