Unable to upgrade Ubuntu 10.04 to 12.04: "WARNING:root:estimate_kernel_size_in_boot() returned '0'

Try to upgrade Ubuntu 10.04 to the next long term release 12.04, but the command do-release-upgrade terminated itself.

The Linode is not using custom kernel but the latest kernel as the screenshot below.

~~http://i.stack.imgur.com/Gxsz6.png" />

From the terminal output (attached below using Script), it looks like the error has something to do with WARNING:root:estimatekernelsizeinboot() returned '0'?

Please share your thoughts if you've experienced similar issues when upgrading Ubuntu 10.04 to the next long term release.

Thank you in advance.

Script started on Fri 13 Nov 2015 11:16:49 AM EST
~$ do-release-upgrade --proposed
Checking for a new ubuntu release

 0% [Working] 
 0% [Working] 
 0% [Working] 
 0% [Working] 
 0% [Working] 
Done Upgrade tool signature

100% [Working] 
100% [Working] 
 0% [Working] 
Done Upgrade tool

100% [Working] 
Done downloading            
authenticate 'precise.tar.gz' against 'precise.tar.gz.gpg' 
extracting 'precise.tar.gz'
[sudo] password for begin: 
WARNING:root:estimate_kernel_size_in_boot() returned '0'?
[?1049h[r[m[2J[H[?7h[?1;4;6l[4l[?1h=[0m(B[1;34r[H        [2J[H[2Jruby1.8
samba-common
samba-common-bin
shared-mime-info
smbclient
snmp
ssl-cert
sudo
sysv-rc
sysvinit-utils
tzdata
ubuntu-keyring
udev
unzip
update-manager-core
update-notifier-common
upstart
util-linux
vim
vim-common
vim-runtime
wget
x11-common

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
=== Command detached from window (Wed Nov  4 17:54:48 2015) ===
=== Command terminated with exit status 1 (Wed Nov  4 17:54:49 2015) ===
[7mPress x to destroy or r to resurrect window[27m  
=== Command terminated with exit status 1 (We[27C[?1l>[34;1H
[?1049l[screen is terminating]
~$ exit
Script done on Fri 13 Nov 2015 11:18:26 AM EST

~~