can't login through desktop GUI after upgrade from ubuntu 10.04 to 12.01 desktop

[Lucio M Nicolosi]

On Sat, Oct 20, 2012 at 7:45 PM, Qiubo Su (David Su) <qiubosu at gmail.com> wrote:
> Dear Sir/Madam,
>
> I have just upgraded ubuntu 10.04 32 bits desktop to ubuntu 12.04 32 bits
> desktop (through login into ubuntu 10.04 desktop GUI screen, and then
> upgrade to 12.01 through the popup "update manager" GUI screen), but got
> can't login though GUI screen problem, i.e. when login through the GUI
> screen with the correct password, after a few seconds, it is back to the
> same GUI login screen again. However, it can login in through terminal.
>
> Have spent sometime on googling and trying to resolve the problem, but
> unsucessful (during this period of time, run command tasksel several times
> to install and remove some applications, and I think this may cause some
> config data of the system and some applications removed, but I'm not quite
> sure whether it is the case). I have previously had (when under ubuntu
> 10.04) a lot of very important applications, data/files installed already
> (under my own user directory, i.e. /home/qiubosu/), e.g. wine, openoffice,
> virtualbox (and the vm OS images) etc applications. To avoid to
> damage/destroy these applications, data/files, I think it isn't good to
> carry on "fixing" the problem in the same approach.
>
> it is much appreciated if anyone can help and give some advice on how to
> resovle this problem.
>
> I have below several different approaches, but not quite sure whether they
> are good enough and won't have harmful impact to the system and the
> installed applications, data/files:
>
> 1) burn a CD with the new version of ubuntu desktop, i.e. 12.10, and do a
> reinstall from the CD to upgrade from the current ubuntu 12.01 to new
> version of ubuntu, in order to fix some current system problems, i.e.
> missing some system config data etc.
>
> can anyone make comment on whether this approach is safe and can do the job?
>
> 2) to protect the above mentioned important applications, data/files already
> installed, use an empty harddrive (as 1st harddrive) to do a full install of
> the ubuntu 12.01 desktop with a burned CD, use the current harddrive with
> the mentioned applications, data/files, as a 2nd harddrive. when do a full
> install of ubuntu 12.01 on the 1st harddrive, is it possible to add the 2nd
> harddrive (the current harddrive with the mentioned applications, data/files
> installed) as part of the partition of the new ubuntu installation, so these
> applications, data/files can be accessed under the new ubuntu 12.01 desktop
> without any problems? if yes, how to achieve this?
>
> 3) apart from the above approaches, are there any better approaches to have
> a well-working ubuntu desktop OS (of course, can login through desktop GUI
> screen, and this is the reason for this post), and can access the mentioned
> applications, data/files from there without any problems?
>

Perhaps you could try the aproaches explained on

http://askubuntu.com/questions/129246/after-12-04-upgrade-cant-log-in-although-password-is-correct

L.


-- 
Lucio M. Nicolosi, Eng.