[Bug 1240699] Re: reinstall system extremely slow

[Colin Watson]

It seems to be trying to repack even the .debs that are already
installed in the target system, which of course takes ages.  This seems
less than optimal.  I'm not sure whether this is a bug in apt-clone or
in how ubiquity is calling it.

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Title:
  reinstall system extremely slow

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  Image: 20131016.1 saucy amd64 desktop

  I started an install with "reinstall system" selected on virtualbox a
  little over 20 min. ago. At least for the past 15 min or so, it seems
  to still be stuck on the "Saving installed packages" step.

  A quick look at /var/log/syslog shows that it *is* making progress,
  but it's extremely slow. This was a test install for the iso testing
  before, so I didn't have loads of extra packages installed or
  anything.  Looking at top, I saw it alternating between dpkg-deb and
  rcu_sched being the busiest processes, each taking 20-30% cpu or so.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: ubiquity 2.15.26
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  CasperVersion: 1.336ubuntu1
  Date: Wed Oct 16 15:50:06 2013
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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