I had to use GIMP for the first time on Ubuntu 13.10 a few days ago and its window looks pretty weird. It occupies a full workspace and a third of the workspace below:

But it can not be maximised (note the missing button) neither can it be resized. How can I adjust the GIMP window so that it occupies only one workspace? Thanks.

Update: the output of sudo aptitude show gimp:

Package: gimp                            

State: installed

Automatically installed: no

Version: 2.8.6-1ubuntu1.1

Priority: optional

Section: graphics

Maintainer: Ubuntu Developers <[email protected]>

Architecture: amd64

Uncompressed Size: 15.7 M

Depends: libgimp2.0 (>= 2.8.6), libgimp2.0 (<= 2.8.6-z), gimp-data (>= 2.8.6), gimp-data (<= 2.8.6-z), python-gtk2 (>=

         2.8.0), libgdk-pixbuf2.0-0 (>= 2.24.1), libaa1 (>= 1.4p5), libbabl-0.1-0 (>= 0.1.10), libbz2-1.0, libc6 (>= 2.15),

         libcairo2 (>= 1.10.2), libdbus-1-3 (>= 1.0.2), libdbus-glib-1-2 (>= 0.88), libexif12, libfontconfig1 (>= 2.9.0),

         libfreetype6 (>= 2.2.1), libgegl-0.2-0 (>= 0.2.0), libglib2.0-0 (>= 2.37.3), libgs9 (>= 8.61.dfsg.1), libgtk2.0-0

         (>= 2.24.10), libgudev-1.0-0 (>= 146), libjasper1, libjpeg8 (>= 8c), liblcms1 (>= 1.15-1), libmng1 (>= 1.0.10),

         libpango-1.0-0 (>= 1.29.4), libpangocairo-1.0-0 (>= 1.29.4), libpangoft2-1.0-0 (>= 1.29.4), libpng12-0 (>=

         1.2.13-4), libpoppler-glib8 (>= 0.18.0), librsvg2-2 (>= 2.14.4), libtiff5 (> 4.0.0-1~), libwebkitgtk-1.0-0 (>=

         1.3.10), libwmf0.2-7 (>= 0.2.8.4), libx11-6, libxcursor1 (> 1.1.2), libxext6, libxfixes3, libxmu6, libxpm4, zlib1g

         (>= 1:1.1.4), python:any (>= 2.7.1-0ubuntu2), python2.7

Recommends: ghostscript

Suggests: gimp-help-en | gimp-help, gimp-data-extras, gvfs-backends, libasound2

Conflicts: gimp

Breaks: gimp-plugin-registry (< 4.20120506), gimp-plugin-registry (< 4.20120506)

Replaces: gimp-plugin-registry (< 4.20120506), gimp-plugin-registry (< 4.20120506)

Provides: gimp-helpbrowser, gimp-python

Description: The GNU Image Manipulation Program

 GIMP is an advanced picture editor. You can use it to edit, enhance, and retouch photos and scans, create drawings, and

 make your own images. It has a large collection of professional-level editing tools and filters, similar to the ones you

 might find in Photoshop. Numerous fine-control settings and features like layers, paths, masks, and scripting give you

 total control over your images. 



 Many image file formats are supported, including JPEG, Photoshop (.psd), and Paint Shop Pro (.psp) files. It can also be

 used to scan and print photos. 



 To open files remotely (like over HTTP), install the gvfs-backends package. 



 To use a MIDI device (like a musical keyboard) as an input controller in GIMP, install libasound2 and read the how-to at

 /usr/share/doc/gimp/README.MIDI

Homepage: http://www.gimp.org/