РС
On Ubuntu systems, the python-software-properties package should be installed for better support of PPA repositories. To check if this package is installed, run dpkg -l python-software-properties.а это всё точно установлено уже на хосте?
Also, some Ubuntu releases have a bug in their python-software-properties package, a missing dependency on pycurl, so python-pycurl will need to be manually installed if it is not present once python-software-properties is installed.
On Ubuntu & Debian systems, the python-apt package is required to be installed. To check if this package is installed, run dpkg -l python-apt. python-apt will need to be manually installed if it is not present.
