upgrade from 12.04 or 13.10 to 14.04 not possible due to python3 from blender PPA

You've installed python3 packages from a PPA which is preventing the upgrade, as the package versions are greater than those in Trusty, to 14.04.

libpython3.4 3.4.0-2ubuntu1irie1~precise1 1
libpython3.4-minimal 3.4.0-2ubuntu1irie1~precise1 1
libpython3.4-stdlib 3.4.0-2ubuntu1irie1~precise1 1

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

Update:

just removing the python3 package didn't work for me . Have to remove the other obsolete packages using "sudo apt-get -y autoremove "Package name here without quotes" .

how I got the obselete package list? did this:

$ cat /var/log/dist-upgrade/main.log | grep Obsolete >> /home/" my A/c user-name without quotes" /desktop>obseletepkgs.txt

Then did a update again (sudo apt-get -y update), then ran the dist-upgrade from the update GUI tool. (for some reason the upgrade didn't start from the command "sudo do-release upgrade" in-spite of my multiple tries , even after reboot/restart.

A window then popped up asking me if I wanted to continue with the upgrade to 14.04 now or later and gave me a time period it would take to update over my net connection and I clicked start ...its right now running on my laptop (typing this from my desktop) .

will update result - if the upgrade is successful or not.

FYI & necessary action/updation in the relevant areas by the Proper expert(s).

forgive me for my mistakes if any - i'm a newbie to linux and would like to get all the help i can get. thxs all.

correction: to:

this is wrong : cat /var/log/dist-upgrade/main.log | grep Obsolete >> /home/" my A/c user-name without quotes" /desktop>obseletepkgs.txt

this is the right one: cat /var/log/dist-upgrade/main.log | grep Obsolete >> /home/" my A/c user-name without quotes" /desktop/obseletepkgs.txt

sorry
-jb

also i removed the other ppas using ppa-purge. got he list from the Ubuntu software center .