Using konqueror 4:4.2.0-0ubuntu3 from the jaunty beta here. When I start konqueror from the KDE menu, a key shortcut, or form the command line, nothing happens.
Running under gdb reports a SIGSEGV:
(gdb) run
Starting program: /usr/bin/konqueror
(no debugging symbols found)
[lines omitted]
[Thread debugging using libthread_db enabled]
[New Thread 0xb5e9cb40 (LWP 23593)]
konqueror(23593) KServiceFactory::findServiceByDesktopPath: "findServiceByDesktopPath: searchproviders/.desktop not found"
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb5e9cb40 (LWP 23593)]
0xb764c46d in KSycocaEntry::property () from /usr/lib/libkdecore.so.5
(gdb) bt
#0 0xb764c46d in KSycocaEntry::property () from /usr/lib/libkdecore.so.5
#1 0xb441b0ed in ?? () from /usr/lib/kde4/konq_aboutpage.so
#2 0xb44222e0 in ?? () from /usr/lib/kde4/konq_aboutpage.so
#3 0xb7f43096 in ?? () from /usr/lib/libkdeinit4_konqueror.so
#4 0xb7f944f9 in ?? () from /usr/lib/libkdeinit4_konqueror.so
#5 0xb7f4a429 in ?? () from /usr/lib/libkdeinit4_konqueror.so
#6 0xb7f4a5a1 in ?? () from /usr/lib/libkdeinit4_konqueror.so
#7 0xb7f4b07a in ?? () from /usr/lib/libkdeinit4_konqueror.so
#8 0xb7f4bc19 in ?? () from /usr/lib/libkdeinit4_konqueror.so
#9 0xb7f50b02 in ?? () from /usr/lib/libkdeinit4_konqueror.so
#10 0xb7fca11e in kdemain () from /usr/lib/libkdeinit4_konqueror.so
#11 0x080486f2 in _start ()
(gdb) info frame
Stack level 0, frame at 0xbfe20a70:
eip = 0xb764c46d in KSycocaEntry::property(QString const&) const;
saved eip 0xb441b0ed
called by frame at 0xbfe20ca0
Arglist at 0xbfe20a68, args:
Locals at 0xbfe20a68, Previous frame's sp is 0xbfe20a70
Saved registers:
ebp at 0xbfe20a68, esi at 0xbfe20a64, eip at 0xbfe20a6c
(gdb) info registers
eax 0x0 0
ecx 0xbfe20b30 -1075705040
edx 0x0 0
ebx 0xb4426ff4 -1270714380
esp 0xbfe20a50 0xbfe20a50
ebp 0xbfe20a68 0xbfe20a68
esi 0xbfe20b30 -1075705040
edi 0xbfe20bf4 -1075704844
eip 0xb764c46d 0xb764c46d <KSycocaEntry::property(QString const&) const+13>
eflags 0x210286 [ PF SF IF RF ID ]
cs 0x73 115
ss 0x7b 123
ds 0x7b 123
es 0x7b 123
fs 0x0 0
gs 0x33 51
(gdb)
Given that the segv is caused in the konq_aboutpage library, the workaround is to start konqueror at a specific URL. However, this requires command-line interaction.
I can confirm this for intrepid with PPA sources.