If you have a problem that is specific to the Linux/APUS installation, use of specific Linux/APUS packages, or if you think you have found a problem with the Linux/APUS kernel (i.e., a driver problem or a generic kernel problem), you should mail to the Linux/APUS kernel mailing list.
You should describe how to repeat the problem. It's very hard to debug something that cannot be seen. Some problems are periodic or occur at random times in different applications, which is not easy to repeat. In this case, include whatever information you have in the posting.
You can follow the traffic on the kernel list via the news gateway at news://sunsite.auc.dk/sunsite.linux.apus. It's fast and your mail box is not overburdened. You can also join the list (send mail to linux-apus-help@sunsite.auc.dk).
You can post to the list at the address linux-apus@sunsite.auc.dk.