从官网上扒下来的，就e文了。
1.To find your Ubuntu version:
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.10
Release: 9.10
Codename: karmic
2.Check the file /etc/update-manager/release-upgrades.
Prompt=normal is needed when upgrading from any version to a newer version,
Prompt=never will never upgrade your OS.
Prompt=lts will make sure you upgrade from LTS to LTS.
You need to be root to edit this file.
3.Start System/Administration/Update Manager.
If you can not found it, install it:
sudo apt-get install update-manager
4.Click the Check button to check for new updates.
5.If there are any updates to install, use the Install Updates button to install them,
and press Check again after that is complete.
6.A message will appear informing you of the availability of the new release.
7.Click Upgrade.
8.Follow the on-screen instructions.
升级后有两个小问题：
1.数字键盘不随机开启了，原因是下面这个文件被更新了。原来的设置就没了。重加如下：
sudo vim /etc/gdm/Init/Default在文件最后exit 0的前面添加：
if [ -x /usr/bin/numlockx ]; then
numlockx on
fi
然后重启即可。
2.VMware share folder用不了了。
因为VMware tools使用了内核头文件，而头文件更新了，重新安装vmware tools即可。
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