do-release-upgrade doesn't check if /lib has sufficient disk space

I've this old server with a rather silly partition table that allocates 1 GB for / (and has /home, /tmp, /usr, /var on separate partitions).

I just did a do-release-upgrade from 12.04 LTS to 14.04 LTS, and in the end the upgrade failed, because /lib ran out of disk space while unpacking the new kernel modules.

It would be nice if do-release-upgrade checked for sufficient disk space in all partitions.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.2.0-101.141-generic 3.2.76
Uname: Linux 3.2.0-101-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
Date: Wed Apr 27 12:49:10 2016
PackageArchitecture: all
ProcEnviron:
 LC_CTYPE=lt_LT.UTF-8
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-04-27 (0 days ago)