The problem is being caused by faulty memory. I scanned the memory with a memory test tools. I've found a memory card is defective and replaced with a new one. Problem solved.
** Changed in: coreutils (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/955624 Title: md5sum command calculate different code for the same file To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/955624/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs