package kexec-tools 1:2.0.2-3ubuntu4.1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 143

I believe this was due to updat-grub hanging. strace showed it stuck reading from stdin, so I killed it.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: kexec-tools 1:2.0.2-3ubuntu4.1
ProcVersionSignature: Ubuntu 3.0.0-27.44~lucid1-server 3.0.45
Uname: Linux 3.0.0-27-server x86_64
NonfreeKernelModules: binfmt_misc dm_round_robin dm_multipath nfsd veth ip6t_LOG nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipt_LOG xt_limit nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp ebtable_filter ebtables ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs deflate zlib_deflate ctr twofish_generic twofish_x86_64 twofish_common camellia serpent blowfish cast5 des_generic xcbc rmd160 sha512_generic crypto_null af_key iptable_filter ip_tables x_tables ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nfs lockd fscache auth_rpcgss nfs_acl sunrpc bridge stp psmouse xgifb lp serio_raw i3000_edac edac_core parport dcdbas raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov usbhid hid tg3 raid6_pq async_tx raid1 raid0 multipath linear
ApportVersion: 2.0.1-0ubuntu17.2
Architecture: amd64
Date: Sun May 26 19:28:30 2013
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 143
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MarkForUpload: True
SourcePackage: kexec-tools
Title: package kexec-tools 1:2.0.2-3ubuntu4.1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 143
UpgradeStatus: Upgraded to precise on 2013-05-26 (0 days ago)