There is no public key available for the following key IDs:3B4FE6ACC0B21F32

ubuntu 运行完sudo apt-get update之后，提示

W: There is no public key available for the following key IDs:
3B4FE6ACC0B21F32

解决方法是执行:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32

参考

1. linux下apt-get出现“no public key available…”解决方法