I had the same problem after updating a freshly installed Lucid Lynx (10.04) 
system with the package grub-pc 1.98-1ubuntu6.
The program took ages (minutes that is) and then displayed, that the UUIDs had 
changed and I should point out which drives are the ones to install grub to. 
The presets were correct, yet pressing okay didn't help, after that the package 
installation hang and needed to be killed. 
My system uses software mirrored (RAID 1) drives (md0 /home, md1 /, md2 swap).
It may have been just a coincidence, but polkitd took up 50% of CPU time,and 
dbus daemon 12% when this happend

Needed to do do dpkg -configure -a which caused the same problem, but when 
killed after the question were to install I was able to apt-get remove -purge 
grub-pc and reinstall it.
Unfortunately this didn't help, so I finally reinstalled the Lynx.

$ lspci
00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev f3)
00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio 
Controller (rev a2)
00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev f2)
00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev f3)
00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address 
Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM 
Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
Miscellaneous Control
01:00.0 VGA compatible controller: ATI Technologies Inc RV710 [Radeon HD 4350]
01:00.1 Audio device: ATI Technologies Inc RV710/730
05:06.0 Multimedia video controller: Internext Compression Inc iTVC15 MPEG-2 
Encoder (rev 01)
05:07.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 62)
05:07.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 62)
05:07.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 65)
05:08.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI 
Video and Audio Decoder (rev 05)
05:08.1 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video 
and Audio Decoder [Audio Port] (rev 05)
05:08.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video 
and Audio Decoder [MPEG Port] (rev 05)
05:08.4 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video 
and Audio Decoder [IR Port] (rev 05)
05:0a.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] 
Serial ATA Controller (rev 02)
05:0b.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 
Controller (PHY/Link)
05:0c.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001 Gigabit 
Ethernet Controller (rev 13)

$ mount
/dev/md1 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
/dev/md0 on /home type ext3 (rw)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc 
(rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/sgromer/.gvfs type fuse.gvfs-fuse-daemon 
(rw,nosuid,nodev,user=sgromer)

-- 
Update manager hangs updating grub-pc
https://bugs.launchpad.net/bugs/548923
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