考虑到系统的稳定性，也因为懒，一直没升级Ubuntu 1610，也没有update。最近发现官方已经不支持1610了，而且直接把yakkety的镜像给取消了。所以，即使是利用系统自带的update manager，也无法直接升级到1710，会出现如下的两类错误，

无法更新
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E:The repository 'http://archive.canonical.com/ubuntu yakkety Release' does not have a Release file., 
W:Updating from such a repository can't be done securely, and is therefore disabled by default., 
W:See apt-secure(8) manpage for repository creation and user configuration details., 
E:The repository 'http://archive.ubuntu.com/ubuntu yakkety Release' does not have a Release file., 
W:Updating from such a repository can't be done securely, and is therefore disabled by default., 
W:See apt-secure(8) manpage for repository creation and user configuration details., 
E:The repository 'http://archive.ubuntu.com/ubuntu yakkety-updates Release' does not have a Release file., 
...
无法升级
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An upgrade from 'yakkety' to 'artful' is not supported with this tool.

参考Askubuntu上的问题，有如下的解决方法，

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cd /etc/apt/
# 备份现有的sources.list
sudo cp sources.list sources.list.bkp
# 替换yakkety为artful
sudo vim sources.list
:%s/yakkety/artful/g
# 保存并重新更新和升级
sudo update
sudo upgrade
# 重启系统
reboot

Reference

[1] How to upgrade ubuntu from 1610 to 1710