[Bug 986272] Re: Update manager doesn't calculate free space correctly for distribution upgrade

[bcbc]

2012-04-18 22:18:42,171 DEBUG Free space on /: 1856667648


2012-04-18 22:18:45,900 DEBUG dir '/var/cache/apt/archives' needs '987733436' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (1856667648.000000)
2012-04-18 22:18:45,901 DEBUG dir '/usr' needs '211730432' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (868934212.000000)
2012-04-18 22:18:45,901 DEBUG dir '/usr' needs '52428800' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (657203780.000000)
2012-04-18 22:18:45,901 DEBUG dir '/boot' needs '22345536' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (604774980.000000)
2012-04-18 22:18:45,901 DEBUG dir '/tmp' needs '5242880' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (582429444.000000)
2012-04-18 22:18:45,901 DEBUG dir '/' needs '10485760' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (577186564.000000)
2012-04-18 22:18:45,901 DEBUG dir '/tmp' needs '0.0' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (566700804.000000)
2012-04-18 22:18:45,901 DEBUG dir '/usr' needs '0.0' of '<DistUpgradeCache.FreeSpace object at 0xae731cc>' (566700804.000000)

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https://bugs.launchpad.net/bugs/986272

Title:
  Update manager doesn't calculate free space correctly for distribution
  upgrade

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

Bug description:
  I ran an upgrade from 11.10 to 12.04 with 1.9GB free space. No warning
  was given about insufficient free space. I received two popup windows
  during the upgrade informing me that I was low on space and this went
  down to less than 100MB (as I manually freed up space).

  The problem may be:
  1. ~1800 packages are downloaded (this could be the amount of free space it thinks it needs
  2. After upgrading and removing old packages it uses a net amount of ~500MB (this could be the free space it thinks)
  3. During unpacking and installing 1800 packages it uses 2GB+ <== this is definitely not the amount of space it thinks it needs.

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