Cannot update or install apps

[Glen Ditchfield]

Roughly a week ago , System Settings > Updates showed that updates were available for Document Viewer and for Beru. I tried to update them, repeatedly, individually and together. The download would progress to 100% and the "installing" message would appear, but the apps would not disappear from the "updates" list, and would still be there after I checked for updates again.

Today I uninstalled Document Viewer and tried to reinstall it from the Ubuntu Store. I found it in the store, and pressed "Install". The progress bar quickly advances to 100%, but then the Store shows me a screen displaying
    Download Error
    Download or install failed. Please try again.
        [ Close ]

The same is true for Beru.

I also tried installing Podbird, which I have not previously installed. The same error occurs.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: software-center (not installed)
Uname: Linux 3.4.0-4-flo armv7l
ApportVersion: 2.17-0ubuntu2
Architecture: armhf
Date: Tue Apr 28 19:15:48 2015
InstallationDate: Installed on 2015-04-13 (15 days ago)
InstallationMedia: Ubuntu Vivid Vervet (development branch) - armhf (20150413-020204)
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Glen Ditchfield (gjditchfield)]

The device is a Nexus 7.

[James Tait (jamestait)]

The contents of /home/phablet/.cache/upstart/application-legacy-ubuntu-system-settings-.log may have some useful information.

I note that Beru, Document Viewer and Podbird only require framework ubuntu-sdk-14.10, which should be present on the device.

[Glen Ditchfield (gjditchfield)]

Thanks for the advice, but I reflashed back to Android.

[TenLeftFingers (tenleftfingers)]

I would like room pick up this bug as a submitter, but I cant install Log Viewer or Terminal. I installed Google Plus just before.

[TenLeftFingers (tenleftfingers)]

The downloads have started working again. Seems my going to bed early fixed it?!