Csanyi Pal wrote: > deb-src http://ftp.debian.org/debian/ sid main contrib non-free > deb http://ftp.debian.org/debian/ sid main contrib non-free > > deb-src http://ftp.debian.org/debian/ wheezy main contrib non-free > deb http://ftp.debian.org/debian/ wheezy main contrib non-free > > So it seems that this a mixed system, right? For Testing/Unstable (currently Wheezy/Sid) it does not matter. Packages enter Sid and ten days later migrate to Testing (currently Wheezy) unless blocked by a bug report. For most packages the difference is only a delay of a few days. For others with bugs, or while big transitions happening, they are held longer but eventually will migrate through. A system that has been upgraded will be upgraded to the latest available version. Therefore in the above you have a Sid system, not a Wheezy system. Packages in Sid will be newer than packages in Wheezy. Therefore when you install you will have packages from Sid. Your system is then already a Sid system. [Same thing for Stable to Testing (currently Squeeze to Wheezy). If you have a Squeeze system and add Wheezy lines to the sources.list file and upgrade then you have a Wheezy system, not a Squeeze system. The presence of Squeeze lines don't matter since those packages are older than the ones in Wheezy.] > What would happen if I would commented wheezy lines by using a # and > after that I run 'aptitude update' and 'aptitude safe-upgrade'? Nothing different would happen from what you have today. You already have Sid listed in your sources.list system. If you have upgraded to Sid packages then you already have a Sid system. Removing the Wheezy lines will do nothing different than you have today. Or leaving them in. Other than taking up more memory and running slower because of the need to process so much more data, leaving those Wheezy lines in won't matter either. I would take them out just to simplify things. Right about now there are ten people jumping at the chance to correct me and say, no, that isn't true, Squeeze has package XYZ that was removed from Sid and Wheezy, and Wheezy has the pre-transition version of package ABC that was removed from Sid. They will say that they are really different. Yes, yes, yes to all. They are different release tracks, have their own repositories. Some individual packages or transitions of packages will have been added and removed between the different repositories. Each and every one of those are special cases that would need to be discussed separately. Which is too much to talk about in a quick answer so I am going to ignore this for now. > Can I mess up my system in this way? Yes. You can have a very broken system. But not because of your question. You can have a very broken system because you needed to ask your question. I hate to say this but if you are asking this question then you have not yet acquired the necessary skills to be successful running Sid/Unstable. Sid is often in a broken state and people using it are expected to know how to deal with the problems. Until you have more experience it is better to run Stable, or at the least run Testing, rather than Unstable. Bob
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