Per the bug mentioned in comment 8 use of : in the Dash does not produce the expected results 

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On Mar 11, 2016, 6:25 PM, at 6:25 PM, "Jean Christophe André" <email address hidden> wrote:
>On my side, the error only shows once per session, yes, but… my request
>also never works as expected, ever.
>
>I just want to use the unity-scope-calculator as usual — “Dashing” for
>calc:1+2 — but it doesn't work, neither the first time nor the next
>ones. Is this scope obsolete? Or is it supposed to still work?
>
>If the whole scope-runner-dbus.py thing is affected, it means this
>problem is affecting all Python scopes, that is:
>
>$ ls -l /usr/share/unity-scopes/*/*_daemon.py
>-rw-r--r-- 1 root root  7028 mar 28  2014
>/usr/share/unity-scopes/calculator/unity_calculator_daemon.py
>-rw-r--r-- 1 root root 10731 jui 23  2013
>/usr/share/unity-scopes/chromiumbookmarks/unity_chromiumbookmarks_daemon.py
>-rw-r--r-- 1 root root 10087 jui 23  2013
>/usr/share/unity-scopes/colourlovers/unity_colourlovers_daemon.py
>-rw-r--r-- 1 root root  9772 mar 28  2014
>/usr/share/unity-scopes/devhelp/unity_devhelp_daemon.py
>-rwxr-xr-x 1 root root 25607 mar 18  2014
>/usr/share/unity-scopes/facebook/unity_facebook_daemon.py
>-rw-r--r-- 1 root root  8922 aoû  9  2013
>/usr/share/unity-scopes/firefoxbookmarks/unity_firefoxbookmarks_daemon.py
>-rwxr-xr-x 1 root root 26075 mar 18  2014
>/usr/share/unity-scopes/flickr/unity_flickr_daemon.py
>-rwxr-xr-x 1 root root 13883 nov 25 11:34
>/usr/share/unity-scopes/gdrive/unity_gdrive_daemon.py
>-rwxr-xr-x 1 root root  6939 mar 24  2014
>/usr/share/unity-scopes/manpages/unity_manpages_daemon.py
>-rw-r--r-- 1 root root  8485 jui 23  2013
>/usr/share/unity-scopes/openclipart/unity_openclipart_daemon.py
>-rwxr-xr-x 1 root root 21877 mar 18  2014
>/usr/share/unity-scopes/picasa/unity_picasa_daemon.py
>-rwxr-xr-x 1 root root 24576 mar 18  2014
>/usr/share/unity-scopes/shotwell/unity_shotwell_daemon.py
>-rw-r--r-- 1 root root  8213 mar 28  2014
>/usr/share/unity-scopes/texdoc/unity_texdoc_daemon.py
>-rw-r--r-- 1 root root  8574 jui 23  2013
>/usr/share/unity-scopes/tomboy/unity_tomboy_daemon.py
>-rw-r--r-- 1 root root  8993 jui 23  2013
>/usr/share/unity-scopes/virtualbox/unity_virtualbox_daemon.py
>-rw-r--r-- 1 root root  9967 jui 23  2013
>/usr/share/unity-scopes/yelp/unity_yelp_daemon.py
>-rw-r--r-- 1 root root 11082 jui 23  2013
>/usr/share/unity-scopes/zotero/unity_zotero_daemon.py
>
>-- 
>You received this bug notification because you are subscribed to the
>bug
>report.
>https://bugs.launchpad.net/bugs/1538471
>
>Title:
>  scope-runner-dbus.py assert failure: *** Error in `/usr/bin/python3':
>  free(): invalid next size (fast): 0x0000000001ca17b0 ***
>
>Status in libunity package in Ubuntu:
>  Confirmed
>
>Bug description:
>  No idea what happened.
>
>  ProblemType: Crash
>  DistroRelease: Ubuntu 16.04
>  Package: unity-scopes-runner 7.1.4+15.10.20151002-0ubuntu2
>  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
>  Uname: Linux 4.3.0-7-generic x86_64
>  ApportVersion: 2.19.4-0ubuntu1
>  Architecture: amd64
>AssertionMessage: *** Error in `/usr/bin/python3': free(): invalid next
>size (fast): 0x0000000001ca17b0 ***
>  CrashCounter: 1
>  CurrentDesktop: Unity
>  Date: Wed Jan 27 10:41:54 2016
>  Dependencies:
>   
>  ExecutablePath: /usr/share/unity-scopes/scope-runner-dbus.py
>  InstallationDate: Installed on 2015-04-30 (271 days ago)
>InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64
>(20150422)
>  InterpreterPath: /usr/bin/python3.5
>  PackageArchitecture: all
>ProcCmdline: /usr/bin/python3
>/usr/share/unity-scopes/scope-runner-dbus.py -s info/calculator.scope
>  Signal: 6
>  SourcePackage: libunity
>  StacktraceTop:
>__libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fd789926128
>"*** Error in `%s': %s: 0x%s ***\n") at
>../sysdeps/posix/libc_fatal.c:175
>malloc_printerr (ptr=<optimised out>, str=0x7fd7899261a0 "free():
>invalid next size (fast)", action=1) at malloc.c:4965
>_int_free (av=<optimised out>, p=<optimised out>, have_lock=0) at
>malloc.c:3834
>   __GI___libc_free (mem=<optimised out>) at malloc.c:2950
>?? () from
>/usr/lib/python3/dist-packages/gi/_gi.cpython-35m-x86_64-linux-gnu.so
>SystemImageInfo: Error: command ['system-image-cli', '-i'] failed with
>exit code 2:
>Title: scope-runner-dbus.py assert failure: *** Error in
>`/usr/bin/python3': free(): invalid next size (fast):
>0x0000000001ca17b0 ***
>  UpgradeStatus: No upgrade log present (probably fresh install)
>UserGroups: adm audio cdrom dip libvirtd lpadmin plugdev sambashare
>sudo
>
>To manage notifications about this bug go to:
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