What I did was "sudo aptitude --no-gui", and type u, then U and g, and
choose among proposed conflict resolutions. I didn't know actually this is 
called safe-upgrade. 

I will try directly run "sudo aptitude full-upgrade" in
terminal. I admitted that I wasn't really sure about the appropriate process of 
upgrading
by aptitude, and didn't fully understand of aptitude.  

Thanks guys! :)


Heddle Weaver <weaver2wo...@gmail.com> writes:

> On 16 February 2011 20:06, Jochen Schulz <m...@well-adjusted.de> wrote:
>
>     Qi Qi:
>     >
>     > I have been using debian unstable. After debian 6.0 released, aptitude
>     > upgrading asks me to remove gnome, gnome-core, and
>     > gnome-desktop-enviroment,etc.
>    
>     I doubt that you are using (safe-)upgrade. You are probably having
>     trouble using full-upgrade which you didn't have if you used a
>     safe-upgrade instead.
>
> <large snip>
>
> With aptitude, upgrading to a new distribution, which is essentially what you 
> are doing when moving to a new version of unstable,
> 'aptitude full-upgrade' is appropriate after 'aptitude update'.
>
> Follow this with 'aptitude autoclean'.
>
> Any incremental updates after that, 'aptitude safe-upgrade' is appropriate.
>
> Doing it this way, no problems should be experienced.
> I certainly haven't had any.
>
> Aptitude may object to removing something because of dependency problems, but 
> then install the new version of  that package which will
> resolve those issues.
> But, from what you are saying, you haven't been issuing the correct commands 
> and this is what has created the situation.
> By doing it now, you may very well still resolve the situation satisfactorily.
> I should also recommend installing the package: 'aptitude-doc-(insert 
> appropriate language code here)' which you will be able to find
> through the aptitude interface and read it!
>
> I should also recommend installing another package called 'deborphan' which 
> will help to clean up the mess.
>
> With unstable, it would be smart thinking to also install 'apt-listbugs', and 
> reading the messages it outputs at the end of aptitude
> update before you install anything.
> Regards,
>
> Weaver.
> --
>
> Religion is regarded by the common people as true, 
> by the wise as false, 
> and by the rulers as useful. 
>
> — Lucius Annæus Seneca.
>
> Terrorism, the new religion.
>

-- 
Qi Qi


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