U1 installer hangs forever if apt is locked

[Alistair Buxton]

When the apt database is locked by another package manager, the ubuntuone-installer hangs forever saying "Installing Ubuntu One client." No indication at all is given that you need to close the other package manager.

To reproduce:

1. Do a fresh install, or uninstall U1 client.
2. Start synaptic or another package manager.
3. Start ubuntuone-installer.
4. Wait.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubuntuone-installer 2.99.91-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
Uname: Linux 3.2.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0-0ubuntu1
Architecture: amd64
Date: Fri Mar 30 20:30:59 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntuone-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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