Ubuntu16升級到18

sudo apt update
sudo apt dist-upgrade
sudo apt autoremove
sudo apt-get install update-manager-core
sudo gedit /etc/update-manager/release-upgrades 
確保update-manager行設置為lts
update-manager -c

如果提示：
{%r%}
Your python install is corrupted. Please fix the '/usr/bin/python' symlink.
{%endr%}

可以運行命令解決
{%g%}
sudo ln -sf /usr/bin/python2.7 /usr/bin/python
{%endg%}
或者重裝Python
{%g%}
sudo apt-get install --reinstall python
{%endg%}

參考鏈接：
https://blog.csdn.net/weixin_44003563/article/details/90271622