Pb Xorg after install or try

[Guest]

Hello,

I've wanted to try and install kubuntu 12.10 to testing it but, after reboot, i can't access the guy and i have an error with xorg. someone know how to resolve that ?
Thanks !
(sorry for my english !)

[dibl]

We'll have to know a lot more about your hardware and the messages in ~/.xsession-errors, before much help will come. Were you able to boot the Live "CD", and did it show you the KDE desktop? Meanwhile, if you can press Ctr-Alt-F1, you should see a console prompt. Log in there, then and give these commands:

sudo service kdm stop

sudo apt-get update

sudo apt-get dist-upgrade

After it has finished installing the updates:

sudo shutdown now -r

This will reboot the system. In the unlikely event that a package update has fixed your X issue, you might see the GUI login. If not, we need to know:Make and model of the computer, if it is not home built, including the model of GPU. Or the make and model of the mainboard and GPU if you built it. From the command line, if you issue

lspci -vv

you can see the line that says "VGA" and that shows the model of the GPU.

[Guest]

I try the different things but no change. my computer is an acer 7750ZG. when i issue "lspci -vv", i have on the vga line :

VGA compatible controller: ATI Technologies Inc Thames XT/GL [Radeon HD 7600M Series] (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device 050f
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 44
Region 0: Memory at a0000000 (64-bit, prefetchable) [size=256M]
Region 2: Memory at c0600000 (64-bit, non-prefetchable) [size=128K]
Region 4: I/O ports at 3000 [size=256]
Expansion ROM at c0620000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon

[dibl]

I'm not an AMD/Radeon user, so take this as an experiment, which may or may not help. On your grub menu, press "e" to edit, and add the follow boot option to the kernel boot line:

radeon.modeset=0

Then press "Ctrl-X" to boot. If it happens to work, then you will need to edit the file /etc/default/grub, find the line GRUB_CMDLINE_LINUX_DEFAULT="quiet" and edit it ("kdesudo kate", or sudo nano in a terminal) so that it reads GRUB_CMDLINE_LINUX_DEFAULT="quiet radeon.modeset=0", save it, and then in a terminal run

sudo update-grub

to incorporate the configuration change in grub. If that doesn't work, hopefully a Radeon user will be able to advise you. I searched ubuntu forum and did not find mention of your GPU, so it apparently is not a common problem.