UDMA (ultra DMA), 229
UDMA-ATA systems, 450
UDP/IP datagram, 267
UID. See user ID
ultra DMA (UDMA), 229
umount command, 415
Uniprint drivers, 361
UNIX threading, 427
unstable tree, Debian, 547
untrusted interfaces, 294
untrusted network, 270. See also trusted network
up2date
for Fedora upgrading, 58
options, 43
overview, 40
up2date repository type
apt, 41
dir, 41
Yum, 41
update problems, troubleshooting, 51
updates
non-security-related, 48
security-related, 46
updating, Fedora Core, 39
UPG. See user private groups
upgrade problems, troubleshooting
graphics drivers, 59
overview, 58
third-party updates, checking, 59
Ximian GNOME desktop, updating, 58
upgrade.log file, 55
upgrading, Fedora Core, 51
USB Communication Device Class Abstract Control Model (CDC ACM) specification, 346
USB modems drivers, 346
user access controlling in Apache, 440
user ID (UID), 447. See also group ID; user private groups
user private groups (UPG). See also group ID; user ID
defined, 447
implementing, 447
user space
control system, 272
defined, 270