do-release-upgrade（尝试从 13.10 升级到 14.04）失败并显示以下消息：
[...]
Calculating the changes
Could not determine the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
Restoring original system state
[...]
我该怎么做才能解决这个问题？是因为 吗google-chrome？如果是，我该如何解决？
我跑了sudo apt-get remove xserver-xorg-video-all，似乎已经解决了这个问题。