(Completely revising since I've figured out the ultimate source of the problem) As described in http://ubuntuforums.org/showthread.php?p=8772736, a number of users have found that if multimedia support is enabled within NX, Firefox refuses to launch. This might be ok if Firefox said why it isn't launch, but it provides _zero_ feedback as to what the problem might be... it simply hangs with no output at all. ========================= strace: <.... page and pages of stuff before this.... > open("/usr/lib/firefox-3.6/firefox", O_RDONLY) = 3 fcntl64(3, F_DUPFD, 10) = 10 close(3) = 0 fcntl64(10, F_SETFD, FD_CLOEXEC) = 0 rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGINT, {0x804f5fb, ~[RTMIN RT_1], 0}, NULL, 8) = 0 rt_sigaction(SIGQUIT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, ~[RTMIN RT_1], 0}, NULL, 8) = 0 rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGTERM, {SIG_DFL, ~[RTMIN RT_1], 0}, NULL, 8) = 0 read(10, "#!/bin/sh\n#\n# ***** BEGIN LICENS"..., 8192) = 3931 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7779938) = 16298 close(4) = 0 read(3, "/usr/lib/firefox-3.6\n", 128) = 21 --- SIGCHLD (Child exited) @ 0 (0) --- read(3, "", 128) = 0 close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 16298 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7779938) = 16299 --- SIGCHLD (Child exited) @ 0 (0) --- close(4) = 0 read(3, "firefox\n", 128) = 8 read(3, "", 128) = 0 close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 16299 stat64("/usr/lib/firefox-3.6/run-mozilla.sh", {st_mode=S_IFREG|0755, st_size=10469, ...}) = 0 geteuid32() = 1001 getgid32() = 1000 getegid32() = 1000 getgroups32(0, NULL) = 16 getgroups32(16, [4, 20, 21, 24, 25, 26, 29, 30, 46, 104, 106, 110, 120, 128, 1000, 1001]) = 16 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7779938) = 16300 wait4(-1, where it waits forever until I hit ^C ========================= gdb stack trace Reading symbols from /usr/lib/firefox-3.6/firefox-bin...Reading symbols from /usr/lib/debug/usr/lib/firefox-3.6/firefox-bin...done. (no debugging symbols found)...done. (gdb) run Starting program: /usr/lib/firefox-3.6/firefox-bin [Thread debugging using libthread_db enabled] ....... I hit here after waiting a long time.... Program received signal SIGINT, Interrupt. 0x00363422 in __kernel_vsyscall () (gdb) bt full #0 0x00363422 in __kernel_vsyscall () No symbol table info available. #1 0x005cc829 in __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:142 No locals. #2 0x005c7f59 in _L_lock_966 () from /lib/tls/i686/cmov/libpthread.so.0 No locals. #3 0x005c7ec6 in __pthread_mutex_lock (mutex=0x682014) at pthread_mutex_lock.c:101 ignore3 = 0 ignore1 = -512 ignore2 = 128 max_cnt = 6823956 __PRETTY_FUNCTION__ = "__pthread_mutex_lock" type = #4 0x0067ac36 in malloc_mutex_lock () at jemalloc.c:1368 No locals. #5 malloc_init_hard () at jemalloc.c:5202 i = 0 buf = "\000\b\000\000\000\340)y\266\020\000\000\000\214\361\377\277>\177\"\000\364)y\266\340)y\266\020\000\000\000\000\000\000\000\060\270{\266\340\272{\266\260\022\262\266\000\000\000\000@\311\377\277\346\224\"\000\\\361\377\277", '\000' , "\177\361\377\277!\006#\000t\361\377\277\u0205#", '\000' "\364, \177#\000\320\310\377\277\004\000\000\000\270\310\377\277E\a#\000\b\000\000\000\270)y\266\020\000\000\000\214\361\377\277>\177\"\000\314)y\266\270)y\266\020\000\000\000\000\000\000\000P\u0348\266\250*\u0776\260\022\262\266\000\000\000\000\300\311\377\277\346\224\"\000\\\361\377\277", '\000' , "\177\361\377\277x\361\377\277t\361\377\277!\006#", '\000' "\364, \177#\000P\213\"\000\364\177#\000`\311\377\277\004\000\000\000@\311\377\277E\a#\000\b\000\000\000\220)y\266\020\000\000\000\214\361\377\277>\177\"\000\244)y\266\220)y\266\020\000\000\000\000\000\000\000\000\000\000\001\000\000\000\000\060\006!\267\000\200\376\267\260\022\262"... opts = 0x237ff4 ",\277\001" result = linklen = #6 0x0067d7b5 in malloc_init (num=1, size=20) at jemalloc.c:5181 No locals. #7 calloc (num=1, size=20) at jemalloc.c:5896 ret = num_size = #8 0x00505106 in _dlerror_run (operate=0xfffffe00, args=0xbfffdce0) at dlerror.c:142 result = 0x0 #9 0x00504d4c in __dlsym (handle=0xffffffff, name=0xb66978 "open") at dlsym.c:71 args = {handle = 0xffffffff, name = 0xb66978 "open", who = 0xb666fc, sym = 0x1} result = #10 0x00b666fc in open (pathname=0x67f814 "/proc/cpuinfo", flags=0) at esddsp.c:225 args = mode = func = 0 #11 0x0067ac59 in open () at /usr/include/bits/fcntl2.h:54 No locals. #12 malloc_ncpus () at jemalloc.c:4946 fd = -1073753472 column = buf = "P\213\"\000\300G#\000\064\356\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\222~\"\000\001\000\000\000\244\202#\000\220\354\377\277\364\177#\000\001\000\000\000\260\022\262\266\260\355\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\000\020\262\266\300\355\377\277\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\001\000\000\000P-\u0776\340\355\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\222~\"\000\001\000\000\000\250*\u0776\000\356\377\277\364\177#\000\001\000\000\000\370'\u0776 \356\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000X%\u07760\356\377\277\\\361\377\277\000\000\000\000\364\177#\000\324\065\236\266\020ii\r\254\356\377\277\200J\"\000\206\u77b6\355\063\\\000\364\177#\000P\213\"\000\000\000\000\000\260gw\266\002\000\377\277\000\242\"\000\305\063\\\000d\022\262\266\364\177#\000|\u7776\036\000\000\000\034\357\377\277\245M\"\000\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\060\271z\000\244\375\235\266(E#\000\350"... i = nread = #13 malloc_init_hard () at jemalloc.c:5234 i = 3221221772 buf = "\000\001\000\000\000\060\270{\266p\335\377\277\364\177#\000\001\000\000\000h\265{\266\220\335\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\260\262{\266\240\335\377\277\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\001\000\000\000\000\260{\266\300\335\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\222~\"\000\001\000\000\000hk\203\266\340\335\377\277\364\177#\000\001\000\000\000\250h\203\266\000\336\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\360e\203\266\020\336\377\277\\\361\377\277P\213\"\000\000\337\377\277\344\336\377\277\f\336\377\277\360e\203\266\300\342\344\266x\345\u4da8h\203\266hk\203\266\000\260{\266\000\200\376\267\260\262{\266h\265{\266\060\270{\266\340\272{\266X)\226\266X%\u0776P\u0348\266\250*\u0776\260\022\262\266\000\000\000\000\\\361\377\277\000\000\000\000\242\213\"\001\000\000\000\000\177\361\377\277!\006#\000t\361\377\277\u0205#\000\000\000\000\000\242\213\"\001\000\000\000\000\177\361\377\277\364\177#\000\000\337\377\277\006\000\000\000\344\336\377\277E\a#\000\b\000\000\000\230e\203\266\030\000\000\000\214\361\377\277>\177\"\000\264e\203\266\230e\203\266\030\000\000\000\177\361\377\277\364\177"... opts = 0x0 result = linklen = #14 0x0067d8c5 in malloc_init (size=352) at jemalloc.c:5181 No locals. #15 malloc (size=352) at jemalloc.c:5772 ret = #16 0xb6a37ddf in __fopen_internal (filename=0x5b521a "/proc/filesystems", mode=0x5b510f "r", is32=0) at iofopen.c:76 No locals. #17 0xb6a3a42c in _IO_fopen64 (filename=0x5b521a "/proc/filesystems", mode=0x5b510f "r") at iofopen64.c:39 No locals. #18 0x005ab6f0 in ?? () from /lib/libselinux.so.1 No symbol table info available. #19 0x005b4bfd in ?? () from /lib/libselinux.so.1 No symbol table info available. #20 0x005a30c8 in _init () from /lib/libselinux.so.1 No symbol table info available. #21 0x002298bc in call_init (l=, argc=, argv=0xbffff3a4, env=0xbffff3ac) at dl-init.c:70 init_array = #22 0x00229a21 in _dl_init (main_map=0x238670, argc=, argv=, env=0xbffff3ac) at dl-init.c:134 preinit_array = 0x80 preinit_array_size = i = 46 #23 0x0021c88f in _dl_start_user () from /lib/ld-linux.so.2 No symbol table info available. (gdb) thread apply all backtrace full Thread 1 (Thread 0xb6772760 (LWP 7040)): #0 0x00363422 in __kernel_vsyscall () No symbol table info available. #1 0x005cc829 in __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:142 No locals. #2 0x005c7f59 in _L_lock_966 () from /lib/tls/i686/cmov/libpthread.so.0 No locals. #3 0x005c7ec6 in __pthread_mutex_lock (mutex=0x682014) at pthread_mutex_lock.c:101 ignore3 = 0 ignore1 = -512 ignore2 = 128 max_cnt = 6823956 __PRETTY_FUNCTION__ = "__pthread_mutex_lock" type = #4 0x0067ac36 in malloc_mutex_lock () at jemalloc.c:1368 No locals. #5 malloc_init_hard () at jemalloc.c:5202 i = 0 buf = "\000\b\000\000\000\340)y\266\020\000\000\000\214\361\377\277>\177\"\000\364)y\266\340)y\266\020\000\000\000\000\000\000\000\060\270{\266\340\272{\266\260\022\262\266\000\000\000\000@\311\377\277\346\224\"\000\\\361\377\277", '\000' , "\177\361\377\277!\006#\000t\361\377\277\u0205#", '\000' "\364, \177#\000\320\310\377\277\004\000\000\000\270\310\377\277E\a#\000\b\000\000\000\270)y\266\020\000\000\000\214\361\377\277>\177\"\000\314)y\266\270)y\266\020\000\000\000\000\000\000\000P\u0348\266\250*\u0776\260\022\262\266\000\000\000\000\300\311\377\277\346\224\"\000\\\361\377\277", '\000' , "\177\361\377\277x\361\377\277t\361\377\277!\006#", '\000' "\364, \177#\000P\213\"\000\364\177#\000`\311\377\277\004\000\000\000@\311\377\277E\a#\000\b\000\000\000\220)y\266\020\000\000\000\214\361\377\277>\177\"\000\244)y\266\220)y\266\020\000\000\000\000\000\000\000\000\000\000\001\000\000\000\000\060\006!\267\000\200\376\267\260\022\262"... opts = 0x237ff4 ",\277\001" result = linklen = #6 0x0067d7b5 in malloc_init (num=1, size=20) at jemalloc.c:5181 No locals. #7 calloc (num=1, size=20) at jemalloc.c:5896 ret = num_size = #8 0x00505106 in _dlerror_run (operate=0xfffffe00, args=0xbfffdce0) at dlerror.c:142 result = 0x0 #9 0x00504d4c in __dlsym (handle=0xffffffff, name=0xb66978 "open") at dlsym.c:71 args = {handle = 0xffffffff, name = 0xb66978 "open", who = 0xb666fc, sym = 0x1} result = #10 0x00b666fc in open (pathname=0x67f814 "/proc/cpuinfo", flags=0) at esddsp.c:225 args = mode = func = 0 #11 0x0067ac59 in open () at /usr/include/bits/fcntl2.h:54 No locals. #12 malloc_ncpus () at jemalloc.c:4946 fd = -1073753472 column = buf = "P\213\"\000\300G#\000\064\356\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\222~\"\000\001\000\000\000\244\202#\000\220\354\377\277\364\177#\000\001\000\000\000\260\022\262\266\260\355\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\000\020\262\266\300\355\377\277\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\001\000\000\000P-\u0776\340\355\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\222~\"\000\001\000\000\000\250*\u0776\000\356\377\277\364\177#\000\001\000\000\000\370'\u0776 \356\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000X%\u07760\356\377\277\\\361\377\277\000\000\000\000\364\177#\000\324\065\236\266\020ii\r\254\356\377\277\200J\"\000\206\u77b6\355\063\\\000\364\177#\000P\213\"\000\000\000\000\000\260gw\266\002\000\377\277\000\242\"\000\305\063\\\000d\022\262\266\364\177#\000|\u7776\036\000\000\000\034\357\377\277\245M\"\000\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\060\271z\000\244\375\235\266(E#\000\350"... i = nread = #13 malloc_init_hard () at jemalloc.c:5234 i = 3221221772 buf = "\000\001\000\000\000\060\270{\266p\335\377\277\364\177#\000\001\000\000\000h\265{\266\220\335\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\260\262{\266\240\335\377\277\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\001\000\000\000\000\260{\266\300\335\377\277\000\000\000\000\364\177#\000P\213\"\000\214\361\377\277\222~\"\000\001\000\000\000hk\203\266\340\335\377\277\364\177#\000\001\000\000\000\250h\203\266\000\336\377\277P\213\"\000\\\361\377\277\000\000\000\000\364\177#\000P\213\"\000\001\000\000\000\360e\203\266\020\336\377\277\\\361\377\277P\213\"\000\000\337\377\277\344\336\377\277\f\336\377\277\360e\203\266\300\342\344\266x\345\u4da8h\203\266hk\203\266\000\260{\266\000\200\376\267\260\262{\266h\265{\266\060\270{\266\340\272{\266X)\226\266X%\u0776P\u0348\266\250*\u0776\260\022\262\266\000\000\000\000\\\361\377\277\000\000\000\000\242\213\"\001\000\000\000\000\177\361\377\277!\006#\000t\361\377\277\u0205#\000\000\000\000\000\242\213\"\001\000\000\000\000\177\361\377\277\364\177#\000\000\337\377\277\006\000\000\000\344\336\377\277E\a#\000\b\000\000\000\230e\203\266\030\000\000\000\214\361\377\277>\177\"\000\264e\203\266\230e\203\266\030\000\000\000\177\361\377\277\364\177"... opts = 0x0 result = linklen = #14 0x0067d8c5 in malloc_init (size=352) at jemalloc.c:5181 No locals. #15 malloc (size=352) at jemalloc.c:5772 ret = #16 0xb6a37ddf in __fopen_internal (filename=0x5b521a "/proc/filesystems", mode=0x5b510f "r", is32=0) at iofopen.c:76 No locals. #17 0xb6a3a42c in _IO_fopen64 (filename=0x5b521a "/proc/filesystems", mode=0x5b510f "r") at iofopen64.c:39 No locals. #18 0x005ab6f0 in ?? () from /lib/libselinux.so.1 No symbol table info available. #19 0x005b4bfd in ?? () from /lib/libselinux.so.1 No symbol table info available. #20 0x005a30c8 in _init () from /lib/libselinux.so.1 No symbol table info available. #21 0x002298bc in call_init (l=, argc=, argv=0xbffff3a4, env=0xbffff3ac) at dl-init.c:70 init_array = #22 0x00229a21 in _dl_init (main_map=0x238670, argc=, argv=, env=0xbffff3ac) at dl-init.c:134 preinit_array = 0x80 preinit_array_size = i = 46 #23 0x0021c88f in _dl_start_user () from /lib/ld-linux.so.2 No symbol table info available. (gdb)

When	Who	Action	New State
2010-01-31	MarcRandolph	Give more information	Open
2010-02-04	MarcRandolph	Confirm	Solved
2010-04-25	Matthew B.	Comment	Solved
2010-08-02	Tom Ellis	Comment	Solved
2010-10-01	kenorb	Comment	Solved

Ubuntufirefox package

History of question #99319

Ubuntu
firefox package