重新启动chromebook后无法访问ubuntu

我在Samsung Chromebook 2上下载了Ubuntu，我非常喜欢！我关闭了我的Chromebook，我试图命令Alt+ Ctrl+Forward和我一样之前，我把它关掉，并没有奏效。我进行了搜索，发现可能需要进入Chrome OS终端并输入“ shell”，sudo startunity然后确保在所有这些操作之前，我的Chromebook处于开发模式。

然后，我在该命令下收到此消息：

Entering /mnt/stateful_partition/crouton/chroots/precise...

_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 19:18:20 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=a687a3ef-7b3c-d643-884f-9c8c71b902d3/PARTNROFF=1 hashtree=PARTUUID=a687a3ef-7b3c-d643-884f-9c8c71b902d3/PARTNROFF=1 hashstart=2506752 alg=sha1 root_hexdigest=9dc5e01612a9a39940b3e401eea76252d377c8ae salt=882a85e22f6795821598d31581f0be109557c552116a01b48a0be86871733bfc" noinitrd vt.global_cursor_default=0 kern_guid=a687a3ef-7b3c-d643-884f-9c8c71b902d3 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 ubuntudotcom ) 
Current version of pixman: 0.30.2
        Before reporting problems, check wikidotxdotorg
        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: Tue Dec 29 19:29:55 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.
/usr/bin/xinit: giving up
/usr/bin/xinit: unable to connect to X server: No such file or directory
/usr/bin/xinit: server error
Unmounting /mnt/stateful_partition/crouton/chroots/precise...

我上周下载了Ubuntu，并收到了此消息，但找不到任何内容。在一周中，我一直在想是我在做某事，但是这次我又做了一次，我不认为是我了。另外，在命令后发送的消息中，ubuntuedotcom和wiki是实际的网站，但这是我在此站点上的第一个问题，我的链接不能超过1个，所以我必须将其拼写清楚。