you must install ubuntu at last during dual or triple boot.
1.use windows 7 to delete an empty partition(use the guide in my other post)
2.insert ubuntu cd(if you want to boot through your usb,then download ubuntu from here & download unetbootin from here and burn the iso file in usb device(use the guide in my other post.)
3.restart
4.select try ubuntu without installing(you can surf the internet while installation is going on)
you can also choose install ubuntu directly)
5.select language,place and time zone and click forward.
6.always select other option during ubuntu install.don't use install alongside win 7.i don't know the risk.but you can try it at your own risk.
never choose delete win7 or options alike if you want to dual boot.
7.now all the partitions are shown.like devsd or something like that.so its very hard to identify the drive you want to install ubuntu.we might select the partition with xp or win 7 or other non empty partition.that's why
deleting partition from win 7 is very necessary.
8.select the emty partition and click new option below.
9.give 258 mb size,select the format as ext2(i forgot the format type,but its usually at third option)
and then slect \boot and press ok
10.again select the empty space click new and give 6000 mb select journal4 or alike option and then select \ and press ok
11.again select the empty space click new and give all the remaining size-4000mb(i would recommend at least 10000mb)
12.again select the empty space click new and give remaining 4000mb select loop and press ok.
13.now at bottom choose the drive where you selected \boot(remember by default it chooses your full hd space which will delete all the partitions and give it to ubuntu.so do not forget to select the drive with \boot option)
14.click forward.now your installtion begins.(if you had selected install ubuntu directly in step 4 then yoy can click arrow head in the installation menu.a new screen appear in the box giving other information click it until
a information appear with ask ubuntu in red letters.click it and firefox starts.so you can surf the internet.)
15.after installation in finished(remember never eject the installation device just after the installation box disappear) after sometime you will be asked to remove the installation device.now eject the device.your computer'll restart.
16.you'll see no ubuntu option in boot menu.login to win 7.download easy bcd from here goto boot option,select add new entry,select linux\bsd,in type select grub 2
and click add entry option.
17.select edit boot menu option if ubuntu option has been marked as no then uncheck it.then save setting and restart.
18.now you'll see the boot menu with list of your os's with ubuntu too.
have fun.
