Corrigido meu próprio problema. Baixou a versão mais recente do crouton e emitiu sudo sh ~/Downloads/crouton -u -n chrootname e tudo voltou ao normal.
Aqui chrootname refere-se ao nome de usuário usado durante a instalação do crouton.
Estou usando o Ubuntu 14.04 usando o Crouton em um Chromebook 2 da Toshiba há vários meses. Hoje saí do Crouton e reiniciei o meu Chromebook. Depois de reiniciar e emitir sudo startxfce4 no shell, recebi o seguinte erro
chronos@localhost / $ sudo startxfce4
Entering /mnt/stateful_partition/crouton/chroots/trusty...
/usr/bin/startxfce4: Starting X server
X.Org X Server 1.15.1
Release Date: 2014-04-13
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.2.0-76-generic x86_64 Ubuntu
Current Operating System: Linux localhost 3.10.18 #1 SMP Tue Apr 14 20:43:12 PDT 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=e4e36f0d-ca2b-5940-a7fe-a61287b5a2d8/PARTNROFF=1 hashtree=PARTUUID=e4e36f0d-ca2b-5940-a7fe-a61287b5a2d8/PARTNROFF=1 hashstart=2506752 alg=sha1 root_hexdigest=45e6c45d7f91005eb3265c86cdf50fb85b6449c4 salt=d14d293f1aa4206fae2fe4284ac3a5e3de528f53b75f6b378b55c5ce1c9ddfc5" noinitrd vt.global_cursor_default=0 kern_guid=e4e36f0d-ca2b-5940-a7fe-a61287b5a2d8 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 02:49:29PM
xorg-server 2:1.15.1-0ubuntu2.7 (For technical support please see http://www.ubuntu.com/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: "/var/log/Xorg.1.log", Time: Wed Apr 29 13:43:33 2015
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7f3c407bd848]
(EE) 1: /usr/bin/X (0x7f3c40614000+0x1ad539) [0x7f3c407c1539]
(EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f3c3f710000+0x10340) [0x7f3c3f720340]
(EE) 3: /usr/bin/X (0x7f3c40614000+0xb57a6) [0x7f3c406c97a6]
(EE) 4: /usr/bin/X (xf86BusProbe+0x9) [0x7f3c4069d099]
(EE) 5: /usr/bin/X (InitOutput+0x74d) [0x7f3c406ab6fd]
(EE) 6: /usr/bin/X (0x7f3c40614000+0x59bab) [0x7f3c4066dbab]
(EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f3c3e150ec5]
(EE) 8: /usr/bin/X (0x7f3c40614000+0x451ee) [0x7f3c406591ee]
(EE)
(EE) Segmentation fault at address 0x0
(EE)
Fatal server error:
(EE) Caught signal 11 (Segmentation fault). Server aborting
(EE)
(EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
(EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information.
(EE)
(EE) Server terminated with error (1). Closing log file.
/usr/bin/xinit: giving up
/usr/bin/xinit: unable to connect to X server: Connection refused
/usr/bin/xinit: server error
Not unmounting /mnt/stateful_partition/crouton/chroots/trusty as another instance is using it.
Alguém sabe o que deu errado?
Eu tive um erro semelhante em que o xfce4 não começava de repente depois de uma atualização automática no lado do chrome. Resolveu o problema baixando a versão mais recente do crouton ( link ) e executando sudo sh ~/Downloads/crouton -u -t xfce . ( -u para atualização e -t xfce para especificar a meta de ambiente xfce). Não sou de modo algum um especialista, mas funcionou bem para mim.