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[Al Butler <question76713@xxxxxxxxxxxxxxxxxxxxx>]

Question #76713 on update-manager in ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/update-manager/+question/76713

Al Butler proposed the following answer:
This error can occur if you have another package manger open at the same
time, such as synaptic or any other program that can install/upgrade
packages. If no other package manager running try the following in the
terminal:

sudo ps -A | grep aptitude

sudo ps -A | grep apt-get

sudo ps -A | grep dpkg

sudo ps -A | grep frontend

These commands will show if any of these processes are running. Then if
they are kill them with command.

sudo kill [PROCESS NUMBER]

if you have to kill dpkg, afterwards you will most likely have to run:

dpkg --configure -a

THat should hopefully resolve your issue.

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