Also experiencing this problem with 04282011 AMD64 Desktop LiveCD.
Tracing the ubiquity process gives the following.
Process 17136 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>) = 0
wait4(17140, 0x7fff10d558cc, WNOHANG, NULL) = 0
stat("/proc/17140", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
open("/proc/17140/stat", O_RDONLY) = 18
read(18, "17140 (sudo) S 17136 17140 17140"..., 8191) = 185
read(18, "", 8006) = 0
close(18) = 0
nanosleep({0, 100000000}, NULL) = 0
wait4(17140, 0x7fff10d558cc, WNOHANG, NULL) = 0
stat("/proc/17140", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
open("/proc/17140/stat", O_RDONLY) = 18
read(18, "17140 (sudo) S 17136 17140 17140"..., 8191) = 185
read(18, "", 8006) = 0
close(18) = 0
nanosleep({0, 100000000}, NULL) = 0
wait4(17140, 0x7fff10d558cc, WNOHANG, NULL) = 0
stat("/proc/17140", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
open("/proc/17140/stat", O_RDONLY) = 18
read(18, "17140 (sudo) S 17136 17140 17140"..., 8191) = 185
read(18, "", 8006) = 0
close(18) = 0
Which just repeats over and over and over.
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https://bugs.launchpad.net/bugs/722769
Title:
After prepare for installation ubiquity hang because child wget
process is zombie
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