[Bug 707749] Re: ValueError: Invalid version string

[Stéphane]

Today I tried  to use usb-creator on the following disk images:
kubuntu-13.04-desktop-amd64.iso
debian-live-7.0.0-amd64-kde-desktop.iso

usb-creator worked fine with the Kubuntu image but failed to work with the Debian image.
I used the same USB flash drive twice.
The error message with the Debian image was:
Invalid version string 'GNU/Linux'

This is the OS version displayed by usb-creator for kubuntu-13.04-desktop-amd64.iso:
Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)

And this is the OS version displayed by usb-creator for debian-live-7.0.0-amd64-kde-desktop.iso:
Debian GNU/Linux 7.0.0 "Wheezy" - Official Snapshot amd64 LIVE/INSTALL Binary 20130505-13:41

I have the feeling that usb-creator chokes on slashes in the version
string.

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https://bugs.launchpad.net/bugs/707749

Title:
  ValueError: Invalid version string

Status in “usb-creator” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: usb-creator

  install.mangle_syslinux misuses debian_support.Version to compare
  release versions against each other. This can cause an unexpected
  exception (ValueError: Invalid version string %s) if the value it
  retrieves from .disk/info isn't a valid version for a Debian package.

  usb-creator either should stop abusing debian_support.Version and/or
  catch this exception and set target_os_ver to None.

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