I can not help you with the problems you are asking about directly, but I might be able to assist you in presenting a more informed question in terms of your preparation.
Originally Posted by digambar
I was wondering is my pc not compatible with linux version.
digambar, Unfortunately no one with your brand, model or model variants (vgn-cs12gn through vgn-cs18gn) has posted any information on the popular Linux compatibility sites, favorably or otherwise, in regards to a Linux installation. As TB0ne commented this may not be a compatibility issue at all, though. However, when you suspect compatibility to be the problem in the future the sites that could prove helpful include the following.
Linux on Laptops- Sony
Hardware4Linux- laptops from Sony
Also, try a few different takes on Google searches such as.
vgn-cs12gn OR vgn-cs14gn OR vgn-cs15gn OR vgn-cs17gn OR vgn-cs18gn linux compatib*
vgn-cs12gn OR vgn-cs14gn OR vgn-cs15gn OR vgn-cs17gn OR vgn-cs18gn suse
To all forum members, perhaps someone knows of a more sophisticated way of accomplishing the same thing considering that the wild card (*), as Google claims, “works only on whole words, not parts of words.” For instance vgn-cs*gn produces undesired search results.
Also digambar, please try and include punctuation at the end of each concluded thought. This makes reading your question much easier for those trying to help you.