Ubuntu 14.04 LTS (Trusty Tahr)
Unity
Unity Desktop has been streamlined for the 14.04 LTS release. Important new features include:
Support for High-DPI screens and desktop scaling
New screen saver and lock screen that matches the Unity greeter visual designs, with improved speed and security.
The option (under Appearance settings) to show menus embedded in the window's title bar instead of the top menu bar
The application spread (Super + W) has been redesigned, with new features including the ability to type in order to filter the displayed applications / windows
New window decorations, with improved appearance and performance. Windows contents are now updated live as they are resized
Dash scopes can now be enabled and disabled from Application lens, inside dash itself
General
The rest of the Ubuntu desktop also received many updates. Some important changes include:
Nautilus now defaults to type-ahead find instead of intiating a search when you are looking for files within a directory
Many default applications regained well-integrated menu bars under Unity
New Ubuntu-specific settings application, derived from GNOME's control center
Libreoffice
The Libreoffice office suite has been updated to the latest and greatest verision, 4.2.3, containing new features:
General
A new start center gives previews and easy access to recently used documents
A new flat icon theme: sifr, installable with apt-get install libreoffice-style-sifr
initial HiDPI support
Improved import and export filters
support for BCP 47 language tags
support for native MATE and XFCE file dialogs
Writer
a new default document template
in-place editing of text fields
document search for right-to-left languages
spellcheck and change tracking consolidated
Calc
trendline enhancements: multiple trendlines, force intercept, extrapolation, polynominals, moving averages
a new calculation engine, paving the way for high performance calculation on graphics cards with OpenCL
quick right-click context menu to switch between sheets
random number generation and statistic functions
functions to access web data (WEBSERVICE, FILTERXML)
new functions: LEFTB, LENB, MIDB, RIGHTB, COVARIANCE.P, COVARIANCE.S, STDEV.P, STDEV.S, VAR.P, VAR.S, BETA.DIST, BETA.INV, BINOM.DIST, BINOM.INV, CONFIDENCE.NORM, CONFIDENCE.T, F.DIST, F.DIST.RT, F.INV, F.INV.RT, F.TEST, EXPON.DIST, HYPGEOM.DIST, POISSON.DIST, WEIBULL.DIST, CHISQ.DIST, CHISQ.DIST.RT, CHISQ.INV, CHISQ.INV.RT,CHISQ.TEST, CRITBINOM
The full list of new features in LibreOffice 4.2 can be found here.
Xorg
The Xorg display server and drivers have been updated to the 15.0.1 release and mesa has been updated to 10.
Download: http://releases.ubuntu.com/14.04/
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