Ubuntu自动更换壁纸

壁纸的配置文件trusty.xml在 /usr/share/backgrounds/contest/ 目录下，需要通过管理员权限修改。打开终端，输入命令，

命令为：sudo gedit  /usr/share/backgrounds/contest/trusty.xml

然后输入密码，就可以看到配置文件了

<background>
  <starttime>
    <year>2009</year>
    <month>08</month>
    <day>04</day>
    <hour>00</hour>
    <minute>00</minute>
    <second>00</second>
  </starttime>
<!-- This animation will start at midnight. -->
  <static>
    <duration>10</duration>  //更换图片时间为10秒
    <file>/usr/share/backgrounds/Sea_Fury_by_Ian_Worrall.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>图片渐变时间为0秒
    <from>/usr/share/backgrounds/Sea_Fury_by_Ian_Worrall.jpg</from>
    <to>/usr/share/backgrounds/Reflections_by_Trenton_Fox.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Reflections_by_Trenton_Fox.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Reflections_by_Trenton_Fox.jpg</from>
    <to>/usr/share/backgrounds/Partitura_by_Vincijun.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Partitura_by_Vincijun.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Partitura_by_Vincijun.jpg</from>
    <to>/usr/share/backgrounds/Backyard_Mushrooms_by_Kurt_Zitzelman.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Backyard_Mushrooms_by_Kurt_Zitzelman.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Backyard_Mushrooms_by_Kurt_Zitzelman.jpg</from>
    <to>/usr/share/backgrounds/Water_web_by_Tom_Kijas.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Water_web_by_Tom_Kijas.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Water_web_by_Tom_Kijas.jpg</from>
    <to>/usr/share/backgrounds/Mono_Lake_by_Angela_Henderson.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Mono_Lake_by_Angela_Henderson.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Mono_Lake_by_Angela_Henderson.jpg</from>
    <to>/usr/share/backgrounds/Jelly_Fish_by_RaDu_GaLaN.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Jelly_Fish_by_RaDu_GaLaN.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Jelly_Fish_by_RaDu_GaLaN.jpg</from>
    <to>/usr/share/backgrounds/Ibanez_Infinity_by_Jaco_Kok.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Ibanez_Infinity_by_Jaco_Kok.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Ibanez_Infinity_by_Jaco_Kok.jpg</from>
    <to>/usr/share/backgrounds/Foggy_Forest_by_Jake_Stewart.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Foggy_Forest_by_Jake_Stewart.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Foggy_Forest_by_Jake_Stewart.jpg</from>
    <to>/usr/share/backgrounds/Beach_by_Renato_Giordanelli.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Beach_by_Renato_Giordanelli.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Beach_by_Renato_Giordanelli.jpg</from>
    <to>/usr/share/backgrounds/Berries_by_Tom_Kijas.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Berries_by_Tom_Kijas.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Berries_by_Tom_Kijas.jpg</from>
    <to>/usr/share/backgrounds/Forever_by_Shady_S.jpg</to>
  </transition>
  <static>
    <duration>10</duration>
    <file>/usr/share/backgrounds/Forever_by_Shady_S.jpg</file>
  </static>
  <transition>
    <duration>0.0</duration>
    <from>/usr/share/backgrounds/Forever_by_Shady_S.jpg</from>
    <to>/usr/share/backgrounds/Sea_Fury_by_Ian_Worrall.jpg</to>
  </transition>
</background>

这个文件我修改过，原本

  <duration>10</duration>

中间的数字应该为1795.0，单位为秒。可以将它改为你想要的更换图片的时间，我更改为10，就是每10秒换一次图片。

<duration>0.0</duration>

这个是图片的渐变时间，原本应该是5秒，因为个人喜好设置为了0。

可以按照自己的喜好更换文件夹和图片，注意图片文件的权限要为root（在文件所在目录下输入命令：sudo chown root 文件名 ），如果权限不正确的话就无法读出你要显示的图片，修改完成后保存退出。

最后输入命令：sudo update-grub 刷新一下，然后设置壁纸。

最后，你可以看到那些壁纸在自己的桌面上不停的切换了。