Ubuntu Gnome on my laptop boot up using about 310 MB Ram. When running couples of program, the system takes 700 to 900 MB. Then, I close all programs, Ram usage drops but it keeps at 450 ~ 600 MB Ram. Why doesn't it drop to the initial status as booting up. How can I make the system to release Ram automatically when all programs are closed.
I have 3987MB of RAM on my laptop. Task (System) Manager says that I am using 700MB of this RAM, whilst the command "free -m" says I am using nearly 1500MB. Which one is correct and why do they show two different values?   Thanks for any help.
Shouldn't the twoside option produce a wider margin at the binding/spine edge, rather than the other way around? I'm using \documentclass[twoside]{report}. What is the purpose of the bin directory? What are some examples? Set the QGIS display to show decimal degrees? Using QGIS 2.6.1 Brighton. I am trying to set the CRS for the project to display Decimal Degrees, where it is defaulting to Feet. I can change it in the Properties Dialog, but it does not change it, it is just staying on Feet. How do I change it?  Edit: this layer was imported from a shapefile where it was internally set to Feet. I was able to get the vendor to supply one with Decimal Degrees so my problem is gone. Still would love to know if there was a way to do it myself from within QGIS. How is Cycles different from Blender Internal? How does Cycles work and how is it different from Blender Internal?  Which is better? $a^2b^2+a^2c^2+b^2c^2\leq 3$ Let $a, b, c\geq 0$ s.t.$$(a^2-a+1)(b^2-b+1)(c^2-c+1)=1$$  Show that $ a^2b^2+a^2c^2+b^2c^2\leq 3$.  My idea:  I denote $a+b+c=x$, $ab+bc+ac=y$ and $abc=z$.  Then I have $$x^2+y^2+z^2-xy-xz-yz+2z-y-x=0$$ I have to show that $$y^2-2xz\leq 3$$ I tried to prove it with the sign of trinom, but it doesn't work. Is there a Linux equivalent of Windows' "resource files"? Unable to correct problems, you have held broken packages I'm unable to uninstall MATLAB;  sandeep@sandeep-VPCEH28FN:~$ sudo rm /var/tmp/lm_TMW* [sudo] password for sandeep:  rm: cannot remove '/var/tmp/lm_TMW*': No such file or directory sandeep@sandeep-VPCEH28FN:~$ sudo apt-get purge matlab E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? sandeep@sandeep-VPCEH28FN:~$ sudo apt-get purge matlab-support E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? sandeep@sandeep-VPCEH28FN:~$ PSTricks will not compile \documentclass[12pt]{article} \usepackage[paperheight=9in,paperwidth=13.24in,margin=0in]{geometry} \usepackage{pstricks} \usepackage{graphicx} \begin{document} \thispagestyle{empty} \psset{unit=1in} \begin{pspicture}(13.24in,9in) \psframe[fillstyle=solid,fillcolor=Maroon](0,0)(13.24,9)  \end{pspicture}  \end{document}   I am following a tutorial outlined here:   I am following the Robbers book.  Everything seems fine until I paste the \psframe[fillstyle=solid,fillcolor=Maroon](0,0)(13.24,9)  What could be the problem? Add a Texture to an Object using Python and Blender 2.8 i have trouble to get a script working within Blender 2.8. The following function work perfectly for me in Blender 2.79, but not in 2.8.  def CreateMaterialFromImage(matName, imgPath):     '''Creates and returns a material from an Image'''     realpath = os.path.expanduser(imgPath)     try:         img = bpy.data.images.load(realpath)     except:         raise NameError("Cannot load image %s" % realpath)      # Create image texture from image     cTex = bpy.data.textures.new(matName, type='IMAGE')     cTex.image = img      # Create material     mat = bpy.data.materials.new(matName)      # Add texture slot for color texture     mtex = mat.texture_slots.add()     mtex.texture = cTex     mtex.texture_coords = 'UV'     mtex.use_map_color_diffuse = True     mtex.use_map_color_emission = True     mtex.emission_color_factor = 0.5     mtex.use_map_density = True     mtex.mapping = 'FLAT'     return mat   It seems to be that the material.texture_slots were removed.  Under following Link  i found the note:        Texture slots for materials, lamps and world were removed. They remain   for brushes, particles and freestyle linestyles.      So my question is where do i find this property now or how could i change my code to get things done?  Thanks for your help!  EDIT:  This seems to be an interesting link for people run in to issues by updating their scripts to 2.8. Unfortunately there is no solution for my problem listed, yet. How to disable auto brightening LCD How to make a circular array using offset object as center? I wanted to upgrade to 14.04.2 point release from 14.04.  What I did was:  sudo apt-get update &amp;&amp; sudo apt-get upgrade &amp;&amp;  sudo apt-get dist-upgrade -y   Then I wanted to upgrade to 3.16 kernel, since it wasn't done with the the above command, so what I did was:  sudo apt-get install linux-generic-lts-utopic xserver-xorg-lts-utopic libegl1-mesa-drivers-lts-utopic xserver-xorg-video-all-lts-utopic xserver-xorg-input-all-lts-utopic sudo apt-get install linux-signed-generic-lts-utopic   Now when I do:   uname -a I get   Linux Y500 3.16.0-33-generic #44~14.04.1-Ubuntu SMP Fri Mar 13 10:33:29 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux  cat /etc/os-release | grep VERSION= I get  VERSION="14.04.2 LTS, Trusty Tahr"   And when I do lsb_release -a I get  Distributor ID: Ubuntu Description:    Ubuntu 14.04.2 LTS Release:    14.04 Codename:   trusty   I know that uname -a and lsb_release -a both refer to different info, but why does  cat /etc/os-release | grep VERSION= show different version? for loop in Java runs 3 times before taking next input Why is my attempt at downloading Big Sur failing? I am currently using a MacBook Pro 13&quot; Mid 2018 with Touch Bar. Today macOS Big Sur was released and I tried to download it but it's getting stuck at 484.4 MB. Initially, it shows 16-17 minutes left, but as soon as it reaches 484.4 MB it's stuck and the timer goes till 10 hours! My Wi-Fi is totally stable with a speed of 100 Mbps. I tried to restart my Mac but it still gets stuck. Earlier there were similar issues in the App Store (even now they are). The issue was I was not able to download an app unless I connect to the US VPN. I even contacted support but they were not able to help out. It wasn't a big deal as a VPN could be used. But now even with VPN, it gets stuck. How to get all possible combinations of a list’s elements? I have a list with 15 numbers in, and I need to write some code that produces all 32,768 combinations of those numbers.   I've found  (by Googling) that apparently does what I'm looking for, but I found the code fairly opaque and am wary of using it. Plus I have a feeling there must be a more elegant solution.  The only thing that occurs to me would be to just loop through the decimal integers 1–32768 and convert those to binary, and use the binary representation as a filter to pick out the appropriate numbers.   Does anyone know of a better way? Using map(), maybe? Does the shebang determine the shell which runs the script? Potential difference across a zero resistance wire Why are continuous functions the "right" morphisms between topological spaces? ReSharper likes to point out multiple functions per ASP.NET page that could be made static. Does it help me if I do make them static? Should I make them static and move them to a utility class?