I get very often:

gdb) run
Starting program: /usr/bin/owncloud
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe5efa700 (LWP 21986)]
[New Thread 0x7fffe54ee700 (LWP 21987)]

Program received signal SIGPIPE, Broken pipe.
0x00007ffff54d3e8d in write () at ../sysdeps/unix/syscall-template.S:84
84      ../sysdeps/unix/syscall-template.S: Datei oder Verzeichnis nicht
gefunden.
(gdb)



- -- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (900, 'testing'), (800, 'unstable'), (500, 'testing-updates'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.4.0-1-amd64 (SMP w/6 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages owncloud-client depends on:
ii  libc6                 2.22-5
ii  libgcc1               1:5.3.1-13
ii  libowncloudsync0      2.1.1+dfsg-1
ii  libqt5core5a          5.5.1+dfsg-16+b1
ii  libqt5dbus5           5.5.1+dfsg-16+b1
ii  libqt5gui5            5.5.1+dfsg-16+b1
ii  libqt5keychain0       0.5.0-1
ii  libqt5network5        5.5.1+dfsg-16+b1
ii  libqt5sql5-sqlite     5.5.1+dfsg-16+b1
ii  libqt5webkit5         5.5.1+dfsg-2+b1
ii  libqt5widgets5        5.5.1+dfsg-16+b1
ii  libqt5xml5            5.5.1+dfsg-16+b1
ii  libssl1.0.2           1.0.2g-1
ii  libstdc++6            5.3.1-13
ii  owncloud-client-l10n  2.1.1+dfsg-1

owncloud-client recommends no packages.

owncloud-client suggests no packages.

- -- no debconf information
iQIcBAEBCgAGBQJXEHUiAAoJEAn4nzyModJda4gP/j6pxHytpTThZwmtJaDeGn+i
ipDaY4vD1UcV2LV+UAHgupsmdioCXkKJU2xwPmCGa+l+8jWKXEZG3+JO7Vi4Xm7k
3wZkCBK2yWsU9/0QL6ypnsN0ARoA/e0TS+GT/Wz1VtatY9TbEHz+XdKXMPUby4I/
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5QEn05TNPQcnsyHCS9c2yB3RGaRjM8LMQhNxrHFzgvXmdg62X55/aEDWWzE+2yLJ
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okZyZt/kWSZ+C3F3ZH+4GjgJiT+Kb/UigGjXpBaXjZu3clK4tizDhpBXgXyT35Ab
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QpFmbt5vINCfKPKZWF3dnvP8O3lMAl6Prgn6s6Y3U/r6U4h6+pj+p9EPTDQ7CbC8
dqRdLItNsNh9NC8CJj+vEygQzETYFWlcMmx78EQ/cbjdY//+wBNPLnxx+qUDre+V
F6IucdHov/7ErO3oE11dwpgpu2CppnHIDtDkd34jyenSS5/mTkqgjmPKuUuum/3B
tQNSQazfRaD3Qg3o1L5V
=syfF
-----END PGP SIGNATURE-----

Hey,

there are much to less information, to help you. What DE do you use and have
you tried others programs?

this sounds like you have not an uptodate version installed or not a package
from Debian.

sandro

Dear submitter,

as the package owncloud-client has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/969422

The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Sean Whitton (the ftpmaster behind the curtain)

...

Please test the new version of owncloud-client available in Debian
experimental and reply to the bug whether this issue is fixed yet.

...

Please test the new version of owncloud-client available in Debian
experimental and reply to the bug whether this issue is fixed yet.