KNemo crashed with SIGSEGV

We will need more information than this to go on. You mention knemo, which has nothing to do with ubiquity, and you didn't provide any information on the nature of the crash.

I have a similar problem in Kubuntu 15.04 64bits. I installed KNemo but can not run from the menu, with the following message (translated from Spanish): "KDEinit was unable to launch /usr/bin/knemo"
Also if I run it from the terminal:
$ knemo
Segmentation fault (core dumped)

In previous versions of Kubuntu, you could find an entry in Systemsettings to configure KNemo. Apparently, this entry does not exist in Kubuntu Vivid Vervet.

Do you need any other information?

Excause me please. Don't know how I selected ubiquity package. Related is knemo package of course. Probably I can't change it now, right?

Status changed to 'Confirmed' because the bug affects multiple users.

Here is a stack trace, but I am missing some debug symbols and am not sure which package to install right now.
(gdb) run
Starting program: /usr/bin/knemo
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
__strcmp_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:29
29 ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) where
#0 __strcmp_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:29
#1 0x00007ffff193e51f in QMetaType::registerNormalizedType(QByteArray const&, void (*)(void*), void* (*)(void const*), void (*)(void*), void* (*)(void*, void const*), int, QFlags<QMetaType::TypeFlag>, QMetaObject const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2 0x00007ffff1c53160 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#3 0x00007ffff7de95ba in call_init (l=<optimized out>, argc=argc@entry=1,
    argv=argv@entry=0x7fffffffc1f8, env=env@entry=0x7fffffffc208) at dl-init.c:72
#4 0x00007ffff7de96cb in call_init (env=<optimized out>, argv=<optimized out>, argc=<optimized out>,
    l=<optimized out>) at dl-init.c:30
#5 _dl_init (main_map=0x7ffff7ffe188, argc=1, argv=0x7fffffffc1f8, env=0x7fffffffc208) at dl-init.c:120
#6 0x00007ffff7dd9d0a in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
#7 0x0000000000000001 in ?? ()
#8 0x00007fffffffca77 in ?? ()
#9 0x0000000000000000 in ?? ()
(gdb)

It crashes on startup.
I am on Kubuntu Vivid.

yep, it can't start, .. and is the only one systray network monitor available for kubuntu .. I'm in Vivid (Kubuntu 15.04)
I hope there 'll be a fix or workaround soon.