Ubuntu用sudo apt-get update出错：

1.  
   E: Problem executing scripts APT::Update::Post-Invoke-Success ‘if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh > /dev/null; fi‘
2.  
   E: Sub-process returned an error code

先remove libappstream3

1.  
   sudo apt-get remove libappstream3
2.  
   or
3.  
   sudo apt remove libappstream3

sudo apt-get update

参考：

https://askubuntu.com/questions/942895/e-problem-executing-scripts-aptupdatepost-invoke-success