I ran **add-apt-repository ppa:ubuntu-wine/ppa** in docker container, but failed with the notice:

```
Cannot add PPA: 'ppa:ppaname/ppa'.
Please check that the PPA name or format is crrect.

```

Hower it worked on the host.

After googled a lot，I've tried the followings:

```
apt-get install python-software-properties
apt-get install software-properties-common
apt-get install --reinstall ca-certificates

```

and didn't work.

The system on host is ubuntu 14.04,64bit.

The image of container is based on ubuntu 14.04 from DOCKER HUB.

Can anybody help me?