Distribution Release: Ubuntu 9.04
download:
http://ftp.cse.yzu.edu.tw/pub/Linux/Ubuntu/ubuntu-cd/9.04/
ubuntu-9.04-alternate-i386.iso
ubuntu-9.04-desktop-amd64.iso
ubuntu-9.04-server-i386.iso
http://ftp.oss.tw/pub/Linux/Ubuntu/ubuntu-cd/9.04/ubuntu-9.04-desktop-i386.iso
ubuntu-9.04-alternate-i386.iso
ubuntu-9.04-desktop-amd64.iso
ubuntu-9.04-server-i386.iso
---
These release notes document known issues with Ubuntu 9.04 and its variants.
System Requirements
The minimum memory requirement for Ubuntu 9.04 is 256 MB of memory. Note that
some of your system's memory may be unavailable due to being used by the
graphics card. If your computer has only the minimum amount of memory, the
installation process will take longer than normal, but will complete
successfully, and the system will perform adequately once installed.
Systems with less memory may be able to select "Install Ubuntu" from the boot
menu to run just the installer, rather than the whole desktop.
Upgrading
Users of Ubuntu 8.10 can upgrade to Ubuntu 9.04 by a convenient automated
process. Users of older Ubuntu releases need to upgrade to Ubuntu 8.10 first,
and then to 9.04. Complete instructions may be found at
http://www.ubuntu.com/getubuntu/upgrading.
Kubuntu users can upgrade directly from Kubuntu 8.04 to Kubuntu 9.04. Users
upgrading in this way are advised to also read the release notes for Ubuntu
8.10, as the issues described there will also apply.
Other known issues
Performance regressions on Intel graphics cards
Users of Intel video chipsets have reported performance regressions in Ubuntu
8.10 compared with previous releases (bug 252094). Many of the issues have
been resolved in Ubuntu 9.04, but some remain.
*
Some users have found improved performance by using the "greedy"
migration heuristic. This can be done by running "sudo gedit
/etc/X11/xorg.conf", and adding Option "MigrationHeuristic" "greedy" to the
Device section of your xorg.conf.
*
Alternatively, a new experimental acceleration architecture option,
"DRI2/UXA", is available for Intel graphics users which our testing has found
provides significant performance improvements in some cases, but has also
shown risk of severe stability problems. You can opt-in to enable this by
running "sudo gedit /etc/X11/xorg.conf", and adding Option "AccelMethod"
"UXA" to the Device section of your xorg.conf. Users wishing to maximize
stability should stay with the standard default acceleration method, "EXA".
/!\ In some cases this will lead to the graphical environment not
starting at all or becoming entirely unusable. In that case, start into
rescue mode or press Ctrl+Alt+F2 and log into the text console, and use sudo
nano /etc/X11/xorg.conf to revert the UXA option.
*
If none of the above helps, some users reported success with using an
older driver version.
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