missed python-apt dependency

ubuntu-release-upgrader-core depends on python3-distupgrade which in turn depends on python3-apt.

See my screen output log.
"do-release-upgrade" command not working and python-apt is NOT installed and there are NO broken dependecies in system:

root@router:/etc/dhcp# LANG=C apt-get check
Reading package lists... Done
Building dependency tree
Reading state information... Done

So, there are missed dependencies. In other way I will not able to delete python-apt because of depend3ncy problems. So, if I can delete this package without broken dependencies, then no dependency is working.

Status changed to 'Confirmed' because the bug affects multiple users.

I just ran into this:
# do-release-upgrade -d
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [198 B]
Get:2 Upgrade tool [1,140 kB]
Fetched 1,140 kB in 0s (0 B/s)
authenticate 'saucy.tar.gz' against 'saucy.tar.gz.gpg'
extracting 'saucy.tar.gz'
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-wv2pgq/saucy", line 6, in <module>
    from DistUpgrade.DistUpgradeMain import main
  File "/tmp/ubuntu-release-upgrader-wv2pgq/DistUpgrade/DistUpgradeMain.py", line 27, in <module>
    import apt
ImportError: No module named apt

It's been 5 months since it has been reported, can we get this fixed?

The package python3-apt is not getting pulled in when installing ubuntu-release-upgrader-core:

# apt-get install ubuntu-release-upgrader-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  python3-distupgrade python3-update-manager
The following NEW packages will be installed:
  python3-distupgrade python3-update-manager ubuntu-release-upgrader-core
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 201 kB of archives.
After this operation, 1,229 kB of additional disk space will be used.
Do you want to continue [Y/n]?
Get:1 http://nl.archive.ubuntu.com/ubuntu/ raring-updates/main python3-update-manager all 1:0.186.2 [33.9 kB]
Get:2 http://nl.archive.ubuntu.com/ubuntu/ raring-updates/main python3-distupgrade all 1:0.192.13 [143 kB]
Get:3 http://nl.archive.ubuntu.com/ubuntu/ raring-updates/main ubuntu-release-upgrader-core all 1:0.192.13 [23.9 kB]
Fetched 201 kB in 0s (742 kB/s)
Selecting previously unselected package python3-update-manager.
(Reading database ... 42859 files and directories currently installed.)
Unpacking python3-update-manager (from .../python3-update-manager_1%3a0.186.2_all.deb) ...
Selecting previously unselected package python3-distupgrade.
Unpacking python3-distupgrade (from .../python3-distupgrade_1%3a0.192.13_all.deb) ...
Selecting previously unselected package ubuntu-release-upgrader-core.
Unpacking ubuntu-release-upgrader-core (from .../ubuntu-release-upgrader-core_1%3a0.192.13_all.deb) ...
Processing triggers for man-db ...
Setting up python3-update-manager (1:0.186.2) ...
Setting up python3-distupgrade (1:0.192.13) ...
Setting up ubuntu-release-upgrader-core (1:0.192.13) ...

ubuntu-release-upgrader-core depends on python3-apt but it doesn't depend on python-apt (for Python 2.7). The release upgrade process seems to download Python 2.7 code into /tmp which needs python-apt.

While the release upgrade process does run using python2 so ubuntu-release-upgrader should depend on python-apt, I'm curious as to what type of install people performed where python-apt was not installed. It is included with almost every task. Thanks!

python-apt won't be installed in most minimal non-desktop installations, it's not that odd for it to not show up.

I just tried to upgrade a 10.04 Lucid system and ran into this bug, which seems to leave the system in a completely stuck state.
What work around is there, if any?
Trying to manually install python-apt fails.