Help! Ubuntu won't boot up!

I installed Ubuntu on my chromebook and all was working well until I tried installing steam. Не games work because my graphics card was out of датировал so I tried installing intel драйвер update for Ubuntu, it opened but claimed that I didn't have в intel graphics card. I tried doing apt-get update in терминал but it said в bunch of stuff and then said "пахал you root?" so I did sudo apt-get update and it came with another ошибка. I restarted my chrome book and attempted to start xfce4 until this popped up

/ $ sudo startxfce4
Entering /mnt/stateful_partition/crouton/chroots/precise...
/usr/bin/startxfce4: Starting X server

_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root

X.Org X Server 1.11.3
Release Date: 2011-12-16
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.42-61-generic x86_64 Ubuntu
Current Operating System: Linux localhost 3.10.18 #1 SMP Fri Dec 11 19:13:56 PST 2015 x86_64
Kernel command line: cros_secure console= loglevel=7 init=/sbin/init cros_secure oops=panic panic=-1 root=/dev/dm-0 rootwait ro dm_verity.error_behavior=3 dm_verity.max_bios=-1 dm_verity.dev_wait=1 dm="1 vroot none ro 1,0 2506752 verity payload=PARTUUID=a426f256-534d-ba40-a9b8-ed38fc20733b/PARTNROFF=1 hashtree=PARTUUID=a426f256-534d-ba40-a9b8-ed38fc20733b/PARTNROFF=1 hashstart=2506752 alg=sha1 root_hexdigest=d810f4b5d34d05fb3f25e5b659467992216636df salt=43a025c4789be0386addcd863f295a8c95279dd6e3cb00fc3a476e8f409e60a8" noinitrd vt.global_cursor_default=0 kern_guid=a426f256-534d-ba40-a9b8-ed38fc20733b add_efi_memmap boot=local noresume noswap i915.modeset=1 tpm_tis.force=1 tpm_tis.interrupts=0 nmi_watchdog=panic,lapic  
Build Date: 12 February 2015  02:49:01PM
xorg-server 2:1.11.4-0ubuntu10.17 (For technical support please see ubuntu support) 
Current version of pixman: 0.30.2
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(++) Log file: "/tmp/Xorg.crouton.1.log", Time: Sat Dec 26 03:48:02 2015
(==) Using system config directory "/usr/share/X11/xorg.conf.d"

Fatal server error:
no screens found

Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
Please also check the log file at "/tmp/Xorg.crouton.1.log" for additional information.

 ddxSigGiveUp: Closing log
Server terminated with error (1). Closing log file.

Now I can't go into my Ubuntu! Please help!