Reportedly, some clone x87 math coprocessors can cause problems. Permission Denied when I Log In. Your root directory and all the directories up to your home directory must be readable and executable by everybody. See the manual page for chmod or a book on Unix for how to fix the problem. No Utmp Entry.
Modern kernels use a better strategy for writing cached disk blocks.
It will work fine with older kernels as well, so there's no need to keep the old update around. This is nothing to worry about. The message means that your version route is a little out of date, compared to the kernel. You can make the message go away by getting a new version of route from the same place as the kernel source code. Almost all distributions do this.