I've had a lot of problems lately and now when I yet to login the login appears then quickly disappears. Now I'm giving up and just want to reset and start over. But can't login to make a live USB , anyone have an idea of what I can do to get in and access my browser make a live USB and rest?

I can see a couple of options but they depend on you being able to get to a command prompt with a working internet connection.

1. Install another desktop.


2. Burn a new USB installer from command line.

Install another desktop

This does not guarantee a working desktop though. Your problem might be something related to video card and also present in other desktops. Drop to a command line and start of with this:

sudo apt-get update

and then pick ONE of these (to install that specific desktop):

xubuntu-desktop 

lubuntu-desktop 

ubuntu-mate-desktop

I only listed a few (you could also install kUbuntu but for just getting a desktop to be able to make an installation disk might be overkill).

Burn a new USB installer from command line

Download Ubuntu from command line with

wget http://releases.ubuntu.com/14.04/ubuntu-14.04-desktop-amd64.iso

(change the url to a release you want. see http://releases.ubuntu.com and the directories below that for what you need). It will show something like this:

~/Downloads$ wget http://releases.ubuntu.com/14.04/ubuntu-14.04-desktop-amd64.iso

--2015-02-28 21:09:59--  http://releases.ubuntu.com/14.04/ubuntu-14.04-desktop-amd64.iso

Resolving releases.ubuntu.com (releases.ubuntu.com)... 

91.189.92.151, 2001:67c:1360:8c01::1e

Connecting to releases.ubuntu.com (releases.ubuntu.com)|

91.189.92.151|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 1010827264 (964M) [application/x-iso9660-image]

Saving to: ‘ubuntu-14.04-desktop-amd64.iso   6%  58,05M  1,36MB/s   eta 7m 47s

and then "dd" the ISO to the USB flash drive. Pay extra attention to the device name. If you mess this up you could overwrite your current install... I tend to use dmesg:

[26005.823077] sd 7:0:0:0: Attached scsi generic sg3 type 0

[26006.953612] sd 7:0:0:0: [sdc] 30299520 512-byte logical blocks: (15.5 GB/14.4 GiB)

[26006.954291] sd 7:0:0:0: [sdc] Write Protect is off

[26006.954298] sd 7:0:0:0: [sdc] Mode Sense: 23 00 00 00

[26006.954912] sd 7:0:0:0: [sdc] No Caching mode page found

[26006.954918] sd 7:0:0:0: [sdc] Assuming drive cache: write through

[26006.972919]  sdc: sdc1

[26006.976297] sd 7:0:0:0: [sdc] Attached SCSI removable disk

So that would be "sdc". This will burn it (skip the 1st one if you are still in Downloads, skip the 2nd one if it is already installed):

cd ~/Downloads

sudo apt-get install gddrescue

sudo ddrescue -d -D --force ubuntu-14.04-desktop-amd64.iso /dev/sdc

Results:

GNU ddrescue 1.19

Press Ctrl-C to interrupt

rescued:    63504 kB,  errsize:     230 B,  current rate:     196 kB/s

   ipos:    63504 kB,   errors:       1,    average rate:   12700 kB/s

   opos:    63504 kB, run time:       5 s,  successful read:       0 s ago

Finished                                     

and an image of the freshly created USB ISO:

Reinstalling can mean erasing everything, reformatting the partition, loosing all data and installing Ubuntu with a brand new /home/user directory. This is the common result when doing a google search.

This answer is about reinstalling Ubuntu and keeping /home/user directory. The following is from: Ubuntu Reinstallation

Ubuntu Reinstallation

Introduction

Sometimes reinstalling is the quickest way to solve a problem, for example if an upgrade failed or if your graphics driver is broken. When reinstalling, you're most likely want to preserve two things:

• 
  /home folder with your files and settings


• Entries in boot menu (if you have multiple OS installed)

How To Reinstall Ubuntu

Since Hardy it is possible to reinstall Ubuntu without losing the content of the /home folder (the folder that contains program settings, internet bookmarks, emails and all your documents, music, videos and other user files). This can be done even if /home is not on a separate partition (which is the case by default if you did not manually separate it when installing Ubuntu originally). This tutorial can also be used to upgrade Ubuntu (eg 11.04 -> 12.04 from a 12.04 live-CD).

Before doing anything

This operation should not damage your documents but, for security, backup your documents and settings (including /home hidden files) on external disk or DVDs. (eg via CloneZilla) Note: Some special applications settings may be in system folders, eg LAMP, see below in the thread.

Run the Ubuntu installer

• Run the UbuntuInstaller


• Follow the prompts until the "Installation type" (or "Allocate disk space") menu


• Choose the right option as described below:

Choose the right option

There are two possibilities - choose the one that fits what the installer is showing:

• If an "Upgrade 1X.XX to 1Y.YY" option is available (like in the screenshot below), choose it.

• Or, if the above option is not available, choose manual partitioning ("Something-else" option), then select Ubuntu system partition, set its mount point as "/". Be sure to keep the same format type, the same size, and untick the "Format" checkbox or all data on "/" will be deleted!. Also set other partitions (/boot, /home... see DiskSpace) if needed.

Then finish the installation process. (this may take several hours, like a normal install)

After reinstalling

After reinstalling, user accounts must be re-created with the same login and password.

See also

1. Discussion on the forum

Create a Live USB

• How to Create a Bootable Linux USB Flash Drive, the Easy Way