found it out, sorry, this solves.
sudo apt-get install manpages-dev
http://ubuntuforums.org/showthread.php?t=136175
This is weird to me, but marking bug invalid anyway
** Changed in: ubuntu
Status: New => Invalid
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exec has no manpage
https://bugs.launchpad.net/bugs/235614
You received
Thanks for your report.
exec is a builtin command of bash. Take a look at 'man bash' and search
for exec.
Feel free to submit any future bugs you may find.
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exec has no manpage
https://bugs.launchpad.net/bugs/235614
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