Comment 1 for bug 1319213

While I agree with this bug, I believe this is not specific for Dualboot setup. Same would happen with phablet-device-flash too.

User data is wiped by "format data" in the command file ubuntu_command, which is then parsed by the upgrader script, which does actual cleanup. Upgrader script idoes not make difference between full install and updates. So if we choose to clean /var/crash this would have to be added as supported action to ubuntu_command. This would make sense though.

It should be proposed to Ubuntu Engineering for consideration.