Installing emulator device fails if apt is running in background

[Jobin Raju George]

Environment on which this bug was seen:

Ubuntu 14.04 64-bit desktop installed as a VM on VMware Player 6.0 on Ubuntu 12.10 64-bit desktop.
Qt Creator 2.8.1

May be helpful:

lsb_release -rd
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04

apt-cache policy ubuntu-sdk

ubuntu-sdk:
  Installed: 1.110
  Candidate: 1.110
  Version table:
 *** 1.110 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status

How to reproduce this bug:

1. Run an apt instance in background which is installing a package(do not run apt-get update, which allows another apt instance to run).

2. Open ubuntu-sdk and go to Devices -> Emulators and press OK.

3. Now go to logs, you will see the following error message:

---------------------
E
:
Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)

E
:
Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

Checking installed emulator package.
The package is not installed.
Detecting device..
* there is no device connected.

---------------------

4. You will notice that even downloading packages failed because of which installing an emulator device failed.

What I expected?

Installing an emulator device will wait for the background apt to exit and then continue installing the packages required to install an emulator.

Possible solution:

Implement a queue which will wait for background apt to exit and then continue downloading required packages.