system installation - How do I install Ubuntu?

i see full how-to guide on how install ubuntu.

first, need download current version of ubuntu @ download ubuntu desktop. select architecture (32-bit vs 64-bit), , click big orange button. if computer has @ least 2gb of ram, select 64-bit version of ubuntu. if unsure of flavor need, select 32-bit run if have 64-bit processor. may download distro release, such kubuntu or xubuntu or other flavours.
next, downloading large .iso file, 800mb-1.6gb. can take few hours, depending on connection speed. let file download. then, burning onto dvd or liveusb. ubuntu 14.04 .iso file large fit on cd, need either burn dvd or else make ubuntu live usb using flash drive has @ least 2gb. (links windows, if switching operating system check "easy ways switch ubuntu" section on the download page.)
if using windows 7 or higher, may double-click file (assuming don't have program associated it). otherwise, install imgburn (sadly, not open source). may may able right-click , select 'burn disk'.:

^{more instructions can found here or here if need them}
you should have burned disk. if open disk using file manager, there should bunch of files wubi.exe, autorun.inf, pics, , pool, among others. if have 1 file on disk same name iso, make sure using disk burning utility. not drag , drop iso file. not work.
now, put disc in optical drive, , reboot computer. on pc, should have key delete, f2, f10 or key boot sequence menu. can enter bios menu pressing 1 of these keys motherboard splash screen appears when computer booting. otherwise consult manual computer or bios , similar boot external media or choose startup disk (⌥ or alt on macs) find key needed. follow screen prompts boot optical drive new disc in.
assuming not booting uefi, press shift once purple screen picture @ bottom. select language arrow keys , enter. now, should confronted menu. may try ubuntu without installing, or may install it. if want try it, choose "try ubuntu without installing", try it, double-click install ubuntu icon on desktop, , continue guide. note test version slower because running cd/dvd/usb, not hard disk. versions of ubuntu give graphical menu step.
now, confronted checklist. may safely disregard second option 'install third-party software', though adobe flash player , proprietary video codecs may not work, unless enter commands @ end of guide.
now time partition hard disk. if want avoid losing data or dual boot, step crucial. if want clear out whatever on hard disk, , use of space ubuntu, select option, , skip step 10. if want dual boot , trust ubuntu installer (not recommended), select option install side-by-side, , skip step 10. if want manually set dual boot, select choice advanced partitioning , proceed next step.
find current windows partition. should first or second under sda, , type should ntfs. click once, , click edit invoke partition settings dialog. reduce size @ least 40,000 mb, or more if have free space on old installation. if have separate documents partition, may resize instead. click in free space have created , click add, setting type swap area, , giving 1.5-2 times ram (note input box takes sizes in mb, not gb.) have swap space. click in remaining free space , add ext4 partition default size (maximum possible recommended), , mount point /. may want /home partition, user files in ubuntu go. if make mistake anytime during this, click revert.

for more detailed instructions (and screenshots) on step, read how use manual partitioning during installation?
we ready install! click 'install now', , allow partitioning tool in ubuntu installer write changes. should prompted select time zone. ubuntu installer wisely tries guess time zone, assuming have functioning internet connection.
you confronted choice of languages again. select language, , on next step, select keymap (keyboard layout). if unsure, click on button detect keyboard layout.
on next screen, may set username, display name, , password. pick strong password. strong password can contain lowercase alphabetic, uppercase alphabetic, numeric , other printable characters. although username must lowercase, display name displayed in login menu , may contain capital letters , spaces in it.
- if dual boot windows, faced option migrate documents. pick users , folders want migrate.
now may sit no trepidation, until faced prompt stating installation complete.
- if installed on uefi system may want run following commands before booting new installation:
```
sudo su; efi="/target/boot/efi/efi"; \ if [[ -e "${efi}/boot" ]]; \   echo "backup:"; \   mv -v "${efi}/boot/" "${efi}/boot-bak-$(lsb_release -cs)"; \ fi; \ echo "copy:"; \ cp -va "${efi}/ubuntu" "${efi}/boot"; \ arch="$(ls -1 {efi}/ubuntu/shim*.efi)"; \ arch="${arch#*shim}"; \ arch="${arch%.efi}"; \ cp -v "${efi}/boot/shim${arch}.efi" "${efi}/boot/boot${arch}.efi"; 
```
  _{this copy ubuntu's boot files default bootloader location , backup existing files. doing save headaches caused non-standards compliant behavior of uefi firmwares found on virtualbox older hp, toshiba, sony , other devices. related bug report.}
- if changed drives' boot order in bios during step #5 in order system boot live dvd / usb (or system configured boot dvd / usb drive) , click "restart now", the system reboot live dvd / usb , not fresh installation. remember either roll changes made in bios or remove medium (according whether want current boot order configuration stick or not) before booting again.
after finish these steps, connect internet, open terminal (ctrl+alt+t) , run these commands:
```
sudo apt-get update && sudo apt-get dist-upgrade   sudo apt-get install ubuntu-restricted-extras      
```
this update packages on system , install codecs proprietary files restricted copyright (mp3, avi, mpeg, microsoft fonts) , adobe flash player.