更新到最新版本后，貌似AMD显卡驱动出现了问题。开机动画没有了，而且无法更新grub，grub界面显示不全，现在内核也无法更新。各位大哥，指点一下小弟吧！

sudo update-grub2
X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  16 (RRCreateMode)
  Serial number of failed request:  35
  Current serial number in output stream:  35