[Bug 1633897] [NEW] aptitude should warn before removing running kernel

[themusicgod1]

Public bug reported:

1) 
Installed kernel: linux-image-4.4.0-21-generic was the currently running kernel post-upgrade from xenial to yakkety

2) looked up linux-image-4.8.0-22-generic and marked it for install

3) went to 'obsolete and locally created packages' and hit 'r' to see
what options aptitude would provide

There was a lot of packages there -- I was not able to remove the
packages at the end of the upgrade process because wifi was not working.
linux-image-4.4.0-21-generic must have been among them in retrospect

4) hit 'g' twice to start the upgrade - eventually I was met with a 'W'
message saying that the current running kernel was being removed.  This
activity for quite a few versions of debian/ubuntu has brought a user
prompt asking the user to make sure yo knows what they are doing.  This
prompt did not come up, instead aptitude removed the current running
kernel and continued on installing the next version of the kernel
(4.8.0)

While in this case, it *may* seem like Linux 4.8.0 was able to install
successfully, I have seen kernels that have not.  If one of *those*
kernels was the one that was replacing 4.4.0, the system would have been
left in an unbootable state(and may yet be in one).  This is a good
reason why Aptitude should have prompted me upon attempting to remove
it, I would have certainly said to not continue.

Ubuntu: 16.10
Aptitude: 0.8.3-1ubuntu1

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: aptitude 0.8.3-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Oct 16 13:12:50 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-09 (829 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708)
SourcePackage: aptitude
UpgradeStatus: Upgraded to yakkety on 2016-10-16 (0 days ago)

** Affects: aptitude (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug yakkety

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https://bugs.launchpad.net/bugs/1633897

Title:
  aptitude should warn before removing running kernel

Status in aptitude package in Ubuntu:
  New

Bug description:
  1) 
  Installed kernel: linux-image-4.4.0-21-generic was the currently running kernel post-upgrade from xenial to yakkety

  2) looked up linux-image-4.8.0-22-generic and marked it for install

  3) went to 'obsolete and locally created packages' and hit 'r' to see
  what options aptitude would provide

  There was a lot of packages there -- I was not able to remove the
  packages at the end of the upgrade process because wifi was not
  working.  linux-image-4.4.0-21-generic must have been among them in
  retrospect

  4) hit 'g' twice to start the upgrade - eventually I was met with a
  'W' message saying that the current running kernel was being removed.
  This activity for quite a few versions of debian/ubuntu has brought a
  user prompt asking the user to make sure yo knows what they are doing.
  This prompt did not come up, instead aptitude removed the current
  running kernel and continued on installing the next version of the
  kernel (4.8.0)

  While in this case, it *may* seem like Linux 4.8.0 was able to install
  successfully, I have seen kernels that have not.  If one of *those*
  kernels was the one that was replacing 4.4.0, the system would have
  been left in an unbootable state(and may yet be in one).  This is a
  good reason why Aptitude should have prompted me upon attempting to
  remove it, I would have certainly said to not continue.

  Ubuntu: 16.10
  Aptitude: 0.8.3-1ubuntu1

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: aptitude 0.8.3-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sun Oct 16 13:12:50 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-07-09 (829 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708)
  SourcePackage: aptitude
  UpgradeStatus: Upgraded to yakkety on 2016-10-16 (0 days ago)

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