I also find this bug and write a patch for it. The patch is added using quilt against procps_3.2.8-9ubuntu3 in 10.10.
** Patch added: "top_Username_parse.patch" https://bugs.launchpad.net/ubuntu/+source/procps/+bug/686000/+attachment/2058761/+files/top_Username_parse.patch ** Changed in: procps (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/686000 Title: top shows unknown argument when -U is set -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
