apt-get update 报错?报错

1.我按照以下步骤做的

PostgreSQL is available in the default repositories. So enter the following command from the Terminal to install it.

sudo apt-get install postgresql postgresql-contrib

If you’re looking for other versions, add the PostgreSQL repository, and install it as shown below.

On Ubuntu 14.10 systems:

Create the file /etc/apt/sources.list.d/pgdg.list;

vi /etc/apt/sources.list.d/pgdg.list

Add a line for the repository:

deb http://apt.postgresql.org/pub/repos/apt/ utopic-pgdg main

On Ubuntu 14.04, add the following line:

deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main

On Ubuntu 12.04, add the following line:

deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main

Import the repository signing key:

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc
sudo apt-key add -

Update the package lists:

sudo apt-get update

Then install the required version.

sudo apt-get install postgresql-9.4

已经使用过如下命令行

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc
sudo apt-key add -

还是报这错.求解决方法

解决方法:

http://www.boyunjian.com/do/article/snapshot.do?uid=3098256223770225222