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I have two 12.04 , both update to 12.04.2 with kernel 3.2.0-43-generic. Both are using ppa:ubuntu-x-swat/x-updates . I find I install xserver-xorg-video-intel 2.20 in one 12.04 , 2.19 in the other 12.04. Their systems are both updated.

$ apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installed: 2:2.19.0-0ubuntu1~xup1
  Candidate: 2:2.19.0-0ubuntu1~xup1
  Version table:
 *** 2:2.19.0-0ubuntu1~xup1 0
        500 http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status
     2:2.17.0-1ubuntu4.4 0
        500 http://mirrors.ustc.edu.cn/ubuntu/ precise-updates/main amd64 Packages
     2:2.17.0-1ubuntu4 0
        500 http://mirrors.ustc.edu.cn/ubuntu/ precise/main amd64 Packages

$ apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installed: 2:2.20.0-0ubuntu0~precise1
  Candidate: 2:2.20.0-0ubuntu0~precise1
  Version table:
 *** 2:2.20.0-0ubuntu0~precise1 0
        100 /var/lib/dpkg/status
     2:2.19.0-0ubuntu1~xup1 0
        500 http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu/ precise/main amd64 Packages
     2:2.17.0-1ubuntu4.4 0
        500 http://mirrors.ustc.edu.cn/ubuntu/ precise-updates/main amd64 Packages
     2:2.17.0-1ubuntu4 0
        500 http://mirrors.ustc.edu.cn/ubuntu/ precise/main amd64 Packages

Why can not I install 2.20 version in the other 12.04 ? In that 12.04's synaptics , I only find 2.19 version . Why does that ppa offer differently in two systems ? Thanks

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1 Answer 1

up vote 2 down vote accepted

The version 2.20.0 is a local package on your system, because it has no source repository currently associated with it. That means, either you have installed it as a .deb file manually, or you had an other source temporarily added in the past. My guess is, that you had the ppa:ubuntu-x-swat/intel-graphics-updates added to the software sources sometime earlier, did an upgrade, and later you have removed it or changed it to ubuntu-x-swat/x-updates. Based on the exact version string of the xserver-xorg-video-intel package, this seems obvious:

PPA name:       ubuntu-x-swat/x-updates
Latest version: 2:2.19.0-0ubuntu1~xup1

PPA name:       ubuntu-x-swat/intel-graphics-updates
Latest version: 2:2.20.0-0ubuntu0~precise1

Here you can find a more recent version of this driver (2.21.6):

ppa:glasen/intel-driver

If you want to downgrade a package, you have to specify the exact version number to install:

sudo apt-get install xserver-xorg-video-intel=2:2.19.0-0ubuntu1~xup1

share|improve this answer
    
Why does it down-grade to 2.19 if there is no relevant repository? –  waterloo2005 May 22 '13 at 8:26
    
There is no automatic downgrade, the package manager always try to have the packages with the highest version number installed. –  grimpitch May 22 '13 at 8:47
    
ubuntu-x-swat/intel-graphics-updates is enough stable now ? –  waterloo2005 May 23 '13 at 9:39
    
Yes, I think so, that package is already more than 6 months old. –  grimpitch May 23 '13 at 9:52

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