Comment 0 for bug 1886491

[Impact]

 * Users trying to apply changes to package profiles through landscape will get
   an error in the activity. This will result in incomplete apt source list on
   those clients.

[Test Case]
 * install landscape-server-quickstart and landscape-api
 * Create a package profile "minimum packages" and add basic packages (byobu, vim, ubuntu-cloud-keyring). Enable for all computers
 * create a xenial container or machine and install/configure landscape-client

Note that the apply package profile gets stuck and doesn't progress. On the container that was created, running apt update shows:

sudo apt update
Get:1 file:/var/lib/landscape/client/package/binaries ./ InRelease
Ign:1 file:/var/lib/landscape/client/package/binaries ./ InRelease
Get:2 file:/var/lib/landscape/client/package/binaries ./ Release
Err:2 file:/var/lib/landscape/client/package/binaries ./ Release
  File not found - /var/lib/landscape/client/package/binaries/./Release (2: No such file or directory)
Get:3 http://mirror/ubuntu xenial InRelease [247 kB]
Hit:4 http://mirror/ubuntu xenial-updates InRelease
Hit:5 http://mirror/ubuntu xenial-backports InRelease
Hit:6 http://mirror/ubuntu xenial-security InRelease
Reading package lists... Done
E: The repository 'file:/var/lib/landscape/client/package/binaries ./ Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

apt-cache policy landscape-client
landscape-client:
  Installed: 16.03-0ubuntu2.16.04.7
  Candidate: 16.03-0ubuntu2.16.04.7
  Version table:
 *** 16.03-0ubuntu2.16.04.7 500
        500 http://mirror/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     16.03-0ubuntu2 500
        500 http://mirror/ubuntu xenial/main amd64 Packages

This can be easily worked around by:
 * Remove the file /etc/apt/sources.list.d/_landscape-internal-facade.list
 * add-apt-repository ppa:landscape/19.01
 * apt install landscape-client

apt-cache policy landscape-client
landscape-client:
  Installed: 18.03~1070~git.8e52e1d~ubuntu16.04.1
  Candidate: 18.03~1070~git.8e52e1d~ubuntu16.04.1
  Version table:
 *** 18.03~1070~git.8e52e1d~ubuntu16.04.1 500
        500 http://ppa.launchpad.net/landscape/19.01/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
     16.03-0ubuntu2.16.04.7 500
        500 http://mirror.glacier.dev/ubuntu xenial-updates/main amd64 Packages
     16.03-0ubuntu2 500
        500 http://mirror.glacier.dev/ubuntu xenial/main amd64 Packages