Comment 13 for bug 1832757

Test 2:
a) fresh install from t-updates, go to t-proposed
b) fresh install from t-proposed directly

Result: PASS

Details:
At the end, we have two chroots: /tank/trusty-2a and /tank/trusty-2b
# chroot /tank/trusty-2a apt-cache policy ubuntu-advantage-tools
ubuntu-advantage-tools:
  Installed: 19.6~ubuntu14.04.3
  Candidate: 19.6~ubuntu14.04.3
  Version table:
 *** 19.6~ubuntu14.04.3 0
        500 http://br.archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     10ubuntu0.14.04.4 0
        500 http://br.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages

# chroot /tank/trusty-2b apt-cache policy ubuntu-advantage-tools
ubuntu-advantage-tools:
  Installed: 19.6~ubuntu14.04.3
  Candidate: 19.6~ubuntu14.04.3
  Version table:
 *** 19.6~ubuntu14.04.3 0
        500 http://br.archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     10ubuntu0.14.04.4 0
        500 http://br.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages

Diffing content of both chroots:
# find /tank/trusty-2b/ -xdev | sed -r 's,^/tank/[^/]+,,' | sort > full-trusty-2b.list
# find /tank/trusty-2a/ -xdev | sed -r 's,^/tank/[^/]+,,' | sort > full-trusty-2a.list

The diff is:
# diff -u full-trusty-2{a,b}.list
--- full-trusty-2a.list 2019-10-31 14:46:33.307720630 -0300
+++ full-trusty-2b.list 2019-10-31 14:46:26.487592874 -0300
@@ -1567,7 +1567,6 @@
 /opt
 /proc
 /root
-/root/.bash_history
 /root/.bashrc
 /root/.profile
 /run
@@ -13724,7 +13723,6 @@
 /var/cache/apt/archives/sysv-rc_2.88dsf-41ubuntu6_all.deb
 /var/cache/apt/archives/tar_1.27.1-1_amd64.deb
 /var/cache/apt/archives/tzdata_2014b-1_all.deb
-/var/cache/apt/archives/ubuntu-advantage-tools_10ubuntu0.14.04.4_all.deb
 /var/cache/apt/archives/ubuntu-advantage-tools_19.6~ubuntu14.04.3_amd64.deb
 /var/cache/apt/archives/ubuntu-keyring_2012.05.19_all.deb
 /var/cache/apt/archives/ucf_3.0027+nmu1_all.deb

The above shows that trusty-2a went through the trusty-updates u-a-t package, while trusty-2b didn't.