update-manager should forewarn about reboot needed

[Paolo Benvenuto]

update-manager should be aware if after the suggeste upgrade the system need reboot, and warn the user so that he/she can decide when to upgrade the system.

Actually the user may be in such a work that a reboot isn't recommended. Realizing that a reboot is needed after the upgrade has completed and not being able to make it may make difficult keep working.

I'm proposing that update-manager:
- inform the user that the upgrade will bring the need to reboot
- separate the packages that will be responsible for the upgrade need and offer the possibility to upgrade only those that doesn't bring the need to upgrade

Thank you!

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: update-manager 1:0.186.2
ProcVersionSignature: Ubuntu 3.8.0-32.47-generic 3.8.13.10
Uname: Linux 3.8.0-32-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.4
Architecture: amd64
Date: Thu Oct 10 13:34:13 2013
GsettingsChanges:
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'launch-time' b'1381384785'
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-height' b'531'
 b'com.ubuntu.update-manager' b'window-width' b'828'
InstallationDate: Installed on 2013-04-19 (173 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=it_IT:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to raring on 2013-04-26 (167 days ago)

[Peter Kopias (petros-k)]

It would be a nice touch to add some "install updates not requiring reboot" button, so I don't have to cherrypick the kernel out of the upgrade packages, just press the simple one, and go on with my other tasks.

[Travisgevans (travisgevans)]

Duplicate of #658169?

I agree; I'm often don't find it obvious that any of the updates in the list will require a reboot, and it's annoying to install the updates only to have it tell me I need to reboot when I currently can't and having to continue running in an unstable/glitchy half-updated state as a result. It should indicate whether a reboot will be required beforehand.