You could also try replacing line 8 (VERS=...) with this one and let me know 
how that behaves.
VERS=`dpkg -l | grep ^ii |grep linux-image|grep -v linux-image-generic|tr -s ' 
'|cut -d' ' -f3|sort -V | head -n -$NUM_TO_KEEP`

-- 
remove old kernels from grub list
https://bugs.launchpad.net/bugs/241368
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