I've just upgraded my ubuntu (raring to saucy) and I now can't log in to GNOME. As opposed to virtual consoles (Ctrl-Alt-F1, for example). I set it up to log in automatically. But it asks for password now. I type in the password, press Enter, the screen blinks and here I am again at the login screen. Then I looked into /var/log/Xorg.0.log:

[    33.956] Initializing built-in extension DRI2

[    33.956] (II) LoadModule: "glx"

[    33.956] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so

[    33.956] (II) Module glx: vendor="X.Org Foundation"

[    33.956]    compiled for 1.14.3, module version = 1.0.0

[    33.956]    ABI class: X.Org Server Extension, version 7.0

[    33.956] (==) AIGLX enabled

[    33.956] Loading extension GLX

[    33.956] (==) Matched fglrx as autoconfigured driver 0

[    33.956] (==) Matched ati as autoconfigured driver 1

[    33.956] (==) Matched fglrx as autoconfigured driver 2

[    33.956] (==) Matched ati as autoconfigured driver 3

[    33.956] (==) Matched vesa as autoconfigured driver 4

[    33.956] (==) Matched modesetting as autoconfigured driver 5

[    33.956] (==) Matched fbdev as autoconfigured driver 6

[    33.956] (==) Assigned the driver to the xf86ConfigLayout

[    33.956] (II) LoadModule: "fglrx"

[    33.957] (WW) Warning, couldn't open module fglrx

[    33.957] (II) UnloadModule: "fglrx"

[    33.957] (II) Unloading fglrx

[    33.957] (EE) Failed to load module "fglrx" (module does not exist, 0)

[    33.957] (II) LoadModule: "ati"

[    33.957] (WW) Warning, couldn't open module ati

[    33.957] (II) UnloadModule: "ati"

[    33.957] (II) Unloading ati

[    33.957] (EE) Failed to load module "ati" (module does not exist, 0)

[    33.957] (II) LoadModule: "vesa"

[    33.957] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so

[    33.957] (II) Module vesa: vendor="X.Org Foundation"

[    33.957]    compiled for 1.14.1, module version = 2.3.2

[    33.957]    Module class: X.Org Video Driver

[    33.957]    ABI class: X.Org Video Driver, version 14.1

[    33.957] (II) LoadModule: "modesetting"

[    33.957] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so

[    33.957] (II) Module modesetting: vendor="X.Org Foundation"

[    33.957]    compiled for 1.14.1, module version = 0.8.0

[    33.957]    Module class: X.Org Video Driver

[    33.957]    ABI class: X.Org Video Driver, version 14.1

[    33.957] (II) LoadModule: "fbdev"

[    33.957] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so

[    33.958] (II) Module fbdev: vendor="X.Org Foundation"

[    33.958]    compiled for 1.14.1, module version = 0.4.3

[    33.958]    Module class: X.Org Video Driver

[    33.958]    ABI class: X.Org Video Driver, version 14.1

[    33.958] (==) Matched fglrx as autoconfigured driver 0

[    33.958] (==) Matched ati as autoconfigured driver 1

[    33.958] (==) Matched fglrx as autoconfigured driver 2

[    33.958] (==) Matched ati as autoconfigured driver 3

[    33.958] (==) Matched vesa as autoconfigured driver 4

[    33.958] (==) Matched modesetting as autoconfigured driver 5

[    33.958] (==) Matched fbdev as autoconfigured driver 6

[    33.958] (==) Assigned the driver to the xf86ConfigLayout

[    33.958] (II) LoadModule: "fglrx"

[    33.958] (WW) Warning, couldn't open module fglrx

[    33.958] (II) UnloadModule: "fglrx"

[    33.958] (II) Unloading fglrx

[    33.958] (EE) Failed to load module "fglrx" (module does not exist, 0)

[    33.958] (II) LoadModule: "ati"

[    33.958] (WW) Warning, couldn't open module ati

[    33.958] (II) UnloadModule: "ati"

[    33.958] (II) Unloading ati

[    33.958] (EE) Failed to load module "ati" (module does not exist, 0)

[    33.958] (II) LoadModule: "vesa"

[    33.958] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so

[    33.958] (II) Module vesa: vendor="X.Org Foundation"

[    33.958]    compiled for 1.14.1, module version = 2.3.2

[    33.958]    Module class: X.Org Video Driver

[    33.958]    ABI class: X.Org Video Driver, version 14.1

[    33.958] (II) UnloadModule: "vesa"

[    33.958] (II) Unloading vesa

[    33.958] (II) Failed to load module "vesa" (already loaded, 0)

[    33.958] (II) LoadModule: "modesetting"

[    33.959] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so

[    33.959] (II) Module modesetting: vendor="X.Org Foundation"

[    33.959]    compiled for 1.14.1, module version = 0.8.0

[    33.959]    Module class: X.Org Video Driver

[    33.959]    ABI class: X.Org Video Driver, version 14.1

[    33.959] (II) UnloadModule: "modesetting"

[    33.959] (II) Unloading modesetting

[    33.959] (II) Failed to load module "modesetting" (already loaded, 0)

[    33.959] (II) LoadModule: "fbdev"

[    33.959] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so

[    33.959] (II) Module fbdev: vendor="X.Org Foundation"

[    33.959]    compiled for 1.14.1, module version = 0.4.3

[    33.959]    Module class: X.Org Video Driver

[    33.959]    ABI class: X.Org Video Driver, version 14.1

[    33.959] (II) UnloadModule: "fbdev"

[    33.959] (II) Unloading fbdev

[    33.959] (II) Failed to load module "fbdev" (already loaded, 0)

[    33.959] (II) VESA: driver for VESA chipsets: vesa

[    33.959] (II) modesetting: Driver for Modesetting Kernel Drivers: kms

[    33.959] (II) FBDEV: driver for framebuffer: fbdev

[    33.959] (++) using VT number 7

If I install fglrx, it reads:

[    37.152] Initializing built-in extension DRI2

[    37.152] (II) LoadModule: "glx"

[    37.152] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/extensions/libglx.so

[    37.152] (II) Module glx: vendor="Advanced Micro Devices, Inc."

[    37.152]    compiled for 6.9.0, module version = 1.0.0

[    37.152] Loading extension GLX

[    37.153] (==) Matched fglrx as autoconfigured driver 0

[    37.153] (==) Matched ati as autoconfigured driver 1

[    37.153] (==) Matched vesa as autoconfigured driver 2

[    37.153] (==) Matched modesetting as autoconfigured driver 3

[    37.153] (==) Matched fbdev as autoconfigured driver 4

[    37.153] (==) Assigned the driver to the xf86ConfigLayout

[    37.153] (II) LoadModule: "fglrx"

[    37.153] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so

[    37.168] (II) Module fglrx: vendor="FireGL - AMD Technologies Inc."

[    37.168]    compiled for 1.4.99.906, module version = 13.10.10

[    37.168]    Module class: X.Org Video Driver

[    37.168] (II) Loading sub module "fglrxdrm"

[    37.168] (II) LoadModule: "fglrxdrm"

[    37.168] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/linux/libfglrxdrm.so

[    37.169] (II) Module fglrxdrm: vendor="FireGL - AMD Technologies Inc."

[    37.169]    compiled for 1.4.99.906, module version = 13.10.10

[    37.169] (II) LoadModule: "ati"

[    37.169] (WW) Warning, couldn't open module ati

[    37.169] (II) UnloadModule: "ati"

[    37.169] (II) Unloading ati

[    37.169] (EE) Failed to load module "ati" (module does not exist, 0)

[    37.169] (II) LoadModule: "vesa"

[    37.169] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so

[    37.169] (II) Module vesa: vendor="X.Org Foundation"

[    37.169]    compiled for 1.14.1, module version = 2.3.2

[    37.169]    Module class: X.Org Video Driver

[    37.169]    ABI class: X.Org Video Driver, version 14.1

[    37.169] (II) LoadModule: "modesetting"

[    37.170] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so

[    37.170] (II) Module modesetting: vendor="X.Org Foundation"

[    37.170]    compiled for 1.14.1, module version = 0.8.0

[    37.170]    Module class: X.Org Video Driver

[    37.170]    ABI class: X.Org Video Driver, version 14.1

[    37.170] (II) LoadModule: "fbdev"

[    37.170] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so

[    37.170] (II) Module fbdev: vendor="X.Org Foundation"

[    37.170]    compiled for 1.14.1, module version = 0.4.3

[    37.170]    Module class: X.Org Video Driver

[    37.170]    ABI class: X.Org Video Driver, version 14.1

[    37.170] (==) Matched fglrx as autoconfigured driver 0

[    37.170] (==) Matched ati as autoconfigured driver 1

[    37.170] (==) Matched vesa as autoconfigured driver 2

[    37.170] (==) Matched modesetting as autoconfigured driver 3

[    37.170] (==) Matched fbdev as autoconfigured driver 4

[    37.170] (==) Assigned the driver to the xf86ConfigLayout

[    37.170] (II) LoadModule: "fglrx"

[    37.170] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so

[    37.170] (II) Module fglrx: vendor="FireGL - AMD Technologies Inc."

[    37.170]    compiled for 1.4.99.906, module version = 13.10.10

[    37.170]    Module class: X.Org Video Driver

[    37.170] (II) LoadModule: "ati"

[    37.170] (WW) Warning, couldn't open module ati

[    37.170] (II) UnloadModule: "ati"

[    37.171] (II) Unloading ati

[    37.171] (EE) Failed to load module "ati" (module does not exist, 0)

[    37.171] (II) LoadModule: "vesa"

[    37.171] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so

[    37.171] (II) Module vesa: vendor="X.Org Foundation"

[    37.171]    compiled for 1.14.1, module version = 2.3.2

[    37.171]    Module class: X.Org Video Driver

[    37.171]    ABI class: X.Org Video Driver, version 14.1

[    37.171] (II) UnloadModule: "vesa"

[    37.171] (II) Unloading vesa

[    37.171] (II) Failed to load module "vesa" (already loaded, 0)

[    37.171] (II) LoadModule: "modesetting"

[    37.171] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so

[    37.171] (II) Module modesetting: vendor="X.Org Foundation"

[    37.171]    compiled for 1.14.1, module version = 0.8.0

[    37.171]    Module class: X.Org Video Driver

[    37.171]    ABI class: X.Org Video Driver, version 14.1

[    37.171] (II) UnloadModule: "modesetting"

[    37.171] (II) Unloading modesetting

[    37.171] (II) Failed to load module "modesetting" (already loaded, 0)

[    37.171] (II) LoadModule: "fbdev"

[    37.171] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so

[    37.171] (II) Module fbdev: vendor="X.Org Foundation"

[    37.171]    compiled for 1.14.1, module version = 0.4.3

[    37.171]    Module class: X.Org Video Driver

[    37.171]    ABI class: X.Org Video Driver, version 14.1

[    37.171] (II) UnloadModule: "fbdev"

[    37.171] (II) Unloading fbdev

[    37.171] (II) Failed to load module "fbdev" (already loaded, 0)

[    37.171] (II) AMD Proprietary Linux Driver Version Identifier:13.10.10

[    37.171] (II) AMD Proprietary Linux Driver Release Identifier: UNSUPPORTED-13.101                   

[    37.171] (II) AMD Proprietary Linux Driver Build Date: May 23 2013 15:49:35

[    37.171] (II) VESA: driver for VESA chipsets: vesa

[    37.171] (II) modesetting: Driver for Modesetting Kernel Drivers: kms

[    37.171] (II) FBDEV: driver for framebuffer: fbdev

[    37.171] (++) using VT number 7

I did more installing/removing packages than that. There were a moment when it said:

(EE) Failed to load /usr/lib64/xorg/modules/libglamoregl.so: /usr/lib64/xorg/modules/libglamoregl.so: undefined symbol: _glapi_tls_Context

Also there is init: not found in ~/.xsession-errors:

/usr/sbin/lightdm-session: 5: exec: init: not found

Actually, I'm out of ideas. What about you? :)

UPD I've got the same problem on another machine.