[Bug 897853] [NEW] update incorrectly assesses free space in /usr

[Brian J. Murrell]

Public bug reported:

When trying to update the kernel group of packages (i.e. kernel,
headers, etc.) update-manager stops and tells me:

The upgrade needs a total of 263 M free space on disk '/usr'. Please
free at least an additional 88.9 M of disk space on '/usr'. Empty your
trash and remove temporary packages of former installations using 'sudo
apt-get clean'.

But since we know that the only package that's going to want space in
"/usr" is the kernel-headers and since we know the kernel-headers
package actually wants space in /usr/src, we can determine that update-
manager is incorrectly assuming /usr/src/ is in /usr.  /usr/src here has
lots of room for another kernel-headers package:

$ df -h /usr /usr/src
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/rootvol-ubuntu_usr
                      9.9G  9.2G  166M  99% /usr
linux:/usr/src         85G   80G  735M 100% /usr/src

I'm sure if /usr/src had GBs free the complaint would still be the same
since we can see that 735M is well clear of 263M.

Sure enough, I freed space in /usr:


$ df -h /usr /usr/src
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/rootvol-ubuntu_usr
                      9.9G  9.1G  341M  97% /usr
linux:/usr/src         85G   80G  735M 100% /usr/src

and the update proceeded.

So, update manager assuming that /usr/src == /usr is bad and broken.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.5.1
ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
Uname: Linux 2.6.38-12-generic i686
NonfreeKernelModules: ksplice_lks0vd8k_sunrpc_new ksplice_lks0vd8k_lockd_new ksplice_lks0vd8k ksplice_bizjdf26_vmlinux_new ksplice_bizjdf26 ksplice_k2sez3vz ksplice_3l7ltbzk ksplice_r1my3sdv_vmlinux_new ksplice_r1my3sdv ksplice_gs6x6g13_vmlinux_new ksplice_gs6x6g13 ksplice_vc7wclc8_vmlinux_new ksplice_vc7wclc8 nvidia
Architecture: i386
Date: Tue Nov 29 14:55:50 2011
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=C:en
 PATH=(custom, user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2007-04-05 (1699 days ago)

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


** Tags: apport-bug i386 natty

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https://bugs.launchpad.net/bugs/897853

Title:
  update incorrectly assesses free space in /usr

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

Bug description:
  When trying to update the kernel group of packages (i.e. kernel,
  headers, etc.) update-manager stops and tells me:

  The upgrade needs a total of 263 M free space on disk '/usr'. Please
  free at least an additional 88.9 M of disk space on '/usr'. Empty your
  trash and remove temporary packages of former installations using
  'sudo apt-get clean'.

  But since we know that the only package that's going to want space in
  "/usr" is the kernel-headers and since we know the kernel-headers
  package actually wants space in /usr/src, we can determine that
  update-manager is incorrectly assuming /usr/src/ is in /usr.  /usr/src
  here has lots of room for another kernel-headers package:

  $ df -h /usr /usr/src
  Filesystem            Size  Used Avail Use% Mounted on
  /dev/mapper/rootvol-ubuntu_usr
                        9.9G  9.2G  166M  99% /usr
  linux:/usr/src         85G   80G  735M 100% /usr/src

  I'm sure if /usr/src had GBs free the complaint would still be the
  same since we can see that 735M is well clear of 263M.

  Sure enough, I freed space in /usr:

  
  $ df -h /usr /usr/src
  Filesystem            Size  Used Avail Use% Mounted on
  /dev/mapper/rootvol-ubuntu_usr
                        9.9G  9.1G  341M  97% /usr
  linux:/usr/src         85G   80G  735M 100% /usr/src

  and the update proceeded.

  So, update manager assuming that /usr/src == /usr is bad and broken.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: update-manager 1:0.150.5.1
  ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
  Uname: Linux 2.6.38-12-generic i686
  NonfreeKernelModules: ksplice_lks0vd8k_sunrpc_new ksplice_lks0vd8k_lockd_new ksplice_lks0vd8k ksplice_bizjdf26_vmlinux_new ksplice_bizjdf26 ksplice_k2sez3vz ksplice_3l7ltbzk ksplice_r1my3sdv_vmlinux_new ksplice_r1my3sdv ksplice_gs6x6g13_vmlinux_new ksplice_gs6x6g13 ksplice_vc7wclc8_vmlinux_new ksplice_vc7wclc8 nvidia
  Architecture: i386
  Date: Tue Nov 29 14:55:50 2011
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=C:en
   PATH=(custom, user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to natty on 2007-04-05 (1699 days ago)

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