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My Ubuntu computer takes 1-1.5 mins to boot up. Following tips from this question, I generated the bootchart and saw the logs from dmsec but I can't figure what's wrong.

Can someone please help?

This is what I see when I use the dmesg command: http://pastebin.com/j6HnxL0i

Bootchart: enter image description here

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It's very clear: your disk is being used 100% of the time. You can see all the pink in the top being almost all time waiting for I/O. What kind of hard disk drive do you have? And what options did you use for installing Ubuntu on the disk? Anything special? LVM, encryption, GPT partition table, etc. And make sure it's working properly by checking the SMART status with the "Disk Utility". Also run all system updates - you appear to be running an older kernel. –  gertvdijk Aug 26 '13 at 19:54

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