[Bug 955022] [NEW] "Not all updates can be installed" requires a decision most people can't make

[Matthew Paul Thomas]

Public bug reported:

In some situations, Update Manager presents a "Not all updates can be installed" alert box:
------------
Not all updates can be installed

Run a partial upgrade, to install as many updates as possible.

This can be caused by:
* A previous upgrade which didn't complete [1]
* Problems with some of the installed software [2]
* Unofficial software packages not provided by Ubuntu [3]
* Normal changes of a pre-release version of Ubuntu [4]

( Partial Upgrade ) ( Close )
------------

The problem is that except for alpha/beta testers [4], people can't
reasonably be expected to know which of those four has happened, and
whether it actually is a good idea to "run a partial upgrade". And if it
is not a good idea, but they do it anyway, upgrading may leave the
system unusable (bug 802991). We should detect which case has happened,
and handle it automatically instead of putting up an alert box.

For [1], detect it by setting a flag when an update starts and unsetting
it when it finishes. For [2], detect it using aptdaemon. For both [1]
and [2], repair it using aptdaemon's FixIncompleteInstall and
FixBrokenDepends functions.

For [3], distinguish between packages that were installed manually by
themselves, and all other packages. For packages that were installed
manually by themselves, present them as a list of applications and other
things that will be removed by the update. For all other packages,
remove them without comment.

And for alpha/beta testers [4], disallow partial updates altogether (bug
430197).

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/955022

Title:
  "Not all updates can be installed" requires a decision most people
  can't make

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  In some situations, Update Manager presents a "Not all updates can be installed" alert box:
  ------------
  Not all updates can be installed

  Run a partial upgrade, to install as many updates as possible.

  This can be caused by:
  * A previous upgrade which didn't complete [1]
  * Problems with some of the installed software [2]
  * Unofficial software packages not provided by Ubuntu [3]
  * Normal changes of a pre-release version of Ubuntu [4]

  ( Partial Upgrade ) ( Close )
  ------------

  The problem is that except for alpha/beta testers [4], people can't
  reasonably be expected to know which of those four has happened, and
  whether it actually is a good idea to "run a partial upgrade". And if
  it is not a good idea, but they do it anyway, upgrading may leave the
  system unusable (bug 802991). We should detect which case has
  happened, and handle it automatically instead of putting up an alert
  box.

  For [1], detect it by setting a flag when an update starts and
  unsetting it when it finishes. For [2], detect it using aptdaemon. For
  both [1] and [2], repair it using aptdaemon's FixIncompleteInstall and
  FixBrokenDepends functions.

  For [3], distinguish between packages that were installed manually by
  themselves, and all other packages. For packages that were installed
  manually by themselves, present them as a list of applications and
  other things that will be removed by the update. For all other
  packages, remove them without comment.

  And for alpha/beta testers [4], disallow partial updates altogether
  (bug 430197).

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