tdmsoares wrote:So, it was only a problem with the version of at, right?
No, not with the version but the architecture.
tdmsoares wrote:Although the problem is solved, I have some questions remaining: Why in MCC before, it showed only the i586 version, and now only typing the code without any setup in repositories I could install the x86_64 version?
urpmi will default to --strict-arch, so if there is the same package both for i586 and x86_64 and you only install a package by name it will always install the package for your native architecture.
In MCC if you explicitly select the i586 version, it will install that which is not what you want.
And in general you can run i586 code under x86_64, but not the other way around. Why it didn't work for at for you, is hard to tell without further information/debugging.