Comment 11 for bug 1840091

[VERIFICATION TRUSTY]

# Launch an older lxc trusty image:
ii apt 1.0.1ubuntu2.17
ii apt-transport-https 1.0.1ubuntu2.17
ii apt-utils 1.0.1ubuntu2.17
ii libapt-inst1.5:amd64 1.0.1ubuntu2.17
ii libapt-pkg4.12:amd64 1.0.1ubuntu2.17

# Enable trusty-proposed
# Installed u-a-tools from trusty-proposed [10ubuntu0.14.04.4]
.....
The following extra packages will be installed:
  apt apt-transport-https apt-utils libapt-inst1.5 libapt-pkg4.12
Suggested packages:
  dpkg-dev apt-doc
The following NEW packages will be installed:
  ubuntu-advantage-tools
The following packages will be upgraded:
  apt apt-transport-https apt-utils libapt-inst1.5 libapt-pkg4.12
5 upgraded, 1 newly installed, 0 to remove and 162 not upgraded.
Need to get 1880 kB of archives.
After this operation, 196 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libapt-pkg4.12 amd64 1.0.1ubuntu2.23 [647 kB]
Get:2 http://archive.ubuntu.com/ubuntu/ trusty-updates/main apt amd64 1.0.1ubuntu2.23 [962 kB]
Get:3 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libapt-inst1.5 amd64 1.0.1ubuntu2.23 [58.7 kB]
Get:4 http://archive.ubuntu.com/ubuntu/ trusty-updates/main apt-utils amd64 1.0.1ubuntu2.23 [172 kB]
Get:5 http://archive.ubuntu.com/ubuntu/ trusty-updates/main apt-transport-https amd64 1.0.1ubuntu2.23 [25.7 kB]
Get:6 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main ubuntu-advantage-tools all 10ubuntu0.14.04.4 [14.8 kB]
....

# Enable ESM with "ubuntu-advantage-tools enable-esm" cmd
$ apt get update
$ apt get upgrade

No errors observed like previous u-a-tools version.