It is save, in case you feel able to fix the problems like described in 
the release notes. In case you want to have things work out of the box, 
I advice you to continue with 9.4

Ciao, Stefan.

<email address hidden> wrote:
> I still have the  same  Bug.  i  Upgrade and  i  install  from  cero  i
> mean  i do a clean  instal and  my graphic  card  ATI radeon  breaks.
>
> Claudio Fron Chile
>
> 2010/2/6 joherrer <email address hidden>
>
>   
>> I am invited now to upgrade to 9.10.
>> I first installed 9.10 and had to quit due to nvidia.
>> Then my son installed 9.4 and it is doing well.
>> ¿Is it safe to accept the challenge upgrade?
>>
>> --
>> upgrade breaks graphic drivers and x, preventing login or startx
>> https://bugs.launchpad.net/bugs/464591
>> You received this bug notification because you are a direct subscriber
>> of the bug.
>>
>> Status in “xorg” package in Ubuntu: Invalid
>>
>> Bug description:
>> see also here http://ubuntuforums.org/showthread.php?t=1305459
>>
>> for some reasons the upgrade breaks proprietary graphics drivers
>>
>> this means a flickering screen without the possibility to login or startx.
>>
>> ATTENTION
>>
>> Since this bug report is being linked to by news stories, it is getting
>> viewed by many people with nvidia bugs that fail in similar ways but due to
>> unrelated causes. I'd like to direct them to more appropriate bug reports:
>>
>> The "blinks on reboot" issue is a bug in gdm, bug #441638. That blinking
>> symptom will occur for any sort of failure of X to start, and there are a
>> lot of reasons why X may not start, so be aware that just because someone
>> else is reporting this same blinking behavior does not necessarily mean you
>> have the same underlying cause as them, so keep digging. This is causing
>> lots of confusion in bug reports.
>>
>> For those who have upgraded since Intrepid or earlier, there is an issue
>> reported where /sbin/lrm-video can cause nvidia to fail loading. That file
>> no longer exists in Jaunty or Karmic and you can safely delete it as a work
>> around. Bug #467490 describes this issue. I don't know how common this is,
>> but if it is common we may need to make sure the upgrader removes the file
>> properly. Manually uninstalling all nvidia packages *might* clear the file.
>>
>> For people running -rt kernels, such as Ubuntu Studio users, -nvidia has a
>> known incompatibility there, see bug #464125 for example. Similar situation
>> for -pae kernels, see bug #454220 as a recent example.
>>
>> Someone mentioned that "the upgrader disables the proprietary drivers".
>> According to mvo, that is not correct, or at least not intentional. However,
>> the upgrader *does* remove driver entries from xorg.conf if the driver is no
>> longer present after upgrade. As far as I know, this should all work
>> seamlessly for people, however several people have reported that removing
>> their xorg.conf and reinstalling -nvidia helped, so it is possible there is
>> an error in this logic. If you suspect this is the case, what we need is a
>> full bug report filed using 'ubuntu-bug xorg'; in particular we need to see
>> the xorg.conf files so we understand how the upgrader is misbehaving.
>>
>> I see a lot in forum articles the advice that "the solution" is to remove
>> "nvidia" or "fglrx" lines from xorg.conf. While this may help in getting the
>> system functioning again, please note that it is not a solution - it merely
>> turns off the proprietary drivers. Whatever the original problem was is
>> still there, you're just using different video drivers. Also, be aware that
>> both nvidia and fglrx install GL and other libraries on top of the normal
>> system libraries, so if you install one of those drivers and then use
>> something else, it may work for 2D but you may run into severe problems for
>> 3D. This is also a known issue - bug 258038 describes one possible solution
>> we will be considering for Lucid. It's a hard problem to solve for
>> proprietary drivers though.
>>
>> There are almost certainly more nvidia bugs, but we also have plenty of
>> other bug reports (over 300 against -nvidia so far), many of which have been
>> reported using ubuntu-bug so are closer to having the information we need.
>>
>> Finally, regarding people skills, actually after thousands of X bug reports
>> those get worn down to a raw nub so I don't think I have them any more. All
>> that's left is a grumpy X maintainer.
>>
>> p.s. Also see bug 438398 which appears to be the root cause for a lot of
>> the nvidia failures. Unfortunately jockey may not be flagging these errors
>> to the user (bug 441638) leading them to reboot without the nvidia driver
>> fully installed.
>>
>>
>> To unsubscribe from this bug, go to:
>> https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/464591/+subscribe
>>
>>     
>
>
>