huang@huang-ubuntu:~$ sudo rm /etc/apt/apt.conf.d/50unattended-upgrades.ucf-old

[sudo] password for huang:

huang@huang-ubuntu:~$ sudo apt-get update

Hit:1 http://cn.archive.ubuntu.com/ubuntu xenial InRelease

Hit:2 http://archive.ubuntukylin.com:10006/ubuntukylin xenial InRelease

Hit:3 http://cn.archive.ubuntu.com/ubuntu xenial-updates InRelease

Hit:4 http://cn.archive.ubuntu.com/ubuntu xenial-backports InRelease

Get:5 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]

Hit:6 https://download.sublimetext.com apt/dev/ InRelease

Fetched 102 kB in 2s (35.7 kB/s)

Reading package lists... Done

huang@huang-ubuntu:~$ sudo apt-get upgrade

Reading package lists... Done

Building dependency tree

Reading state information... Done

Calculating upgrade... Done

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

huang@huang-ubuntu:~$