update incorrectly assesses free space in /usr

[Brian J. Murrell]

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)

[dino99 (9d9)]

That version is no more maintained