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Revision 3 as of 2009-04-18 13:59:28

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Contents

  1. System Requirements
  2. 最低限必要な環境
  3. Installation
  4. インストール
    1. Recommended packages installed by default
    2. 「推奨パッケージ」はデフォルトでインストールされます
  5. Upgrading
  6. アップグレード
    1. Boot failures on systems with Intel D945 motherboards
    2. Intel D945マザーボードでシステム上のブート失敗
    3. Upgrades from beta may use LABEL= in /etc/fstab
    4. ベータ版からのアップグレードは/etc/fstabでLABEL=が使われる
    5. Upgrades from alphas may need re-encryption of encrypted home directories
    6. アルファ版からのアップグレードは暗号化されたhomeディレクトリの再暗号化が必要になる
    7. Upgrades from Ubuntu 8.10 may have lilo installed
    8. Ubuntu8.10からのアップグレードはliloがインストールされる
    9. Setting wireless regulatory domain via module option no longer supported
    10. モジュールオプション経由でのワイヤレス設定調整領域はすでにサポートされません
    11. Network management applet must be re-added on Kubuntu upgrade
    12. Network managementアプレットはKubuntuアップグレードで再度追加する必要があります
    13. Kubuntu Network Management applet does not connect to WPA2 networks
    14. Kubuntu Network ManagementアプレットはWPA2ネットワークに接続できません
    15. Ctrl-Alt-Backspace disabled by default in Xorg
    16. XorgではデフォルトでCtrl-Alt-Backspaceが無効にされています
    17. Change in notifications of available updates
    18. 利用可能なアップデータの通知における変更
  7. Other known issues
  8. その他の不具合
    1. Performance regressions on Intel graphics cards
    2. Intelグラフィックカードの性能が悪くなっています
    3. Display freezes with Intel graphics cards
    4. Intelグラフィックカードで表示がフリーズする
    5. Lock-ups when deleting files from ext4 filesystems
    6. ext4ファイルシステムからファイルを削除するとき動かなくなる
    7. Switching to ext4 requires manually updating grub
    8. ext4に切り替える場合は手動でgrubのアップデートが必要です
    9. Occasional hangs possible on ARM architecture
    10. ARMアーキテクチャでしばしばハングする可能性がある

These release notes document known issues with Ubuntu 9.04 and its variants. このリリースノートは、Ubuntu 9.04とその派生品に関する既知の不具合について記述しています。

System Requirements

最低限必要な環境

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.

Ubuntu 8.10では、動作に必要な最低限のメモリとして256MBを要求します。一部のコンピュータでは、グラフィックカードが利用するために、メインメモリの一部を自動的に消費していることに注意してください。もし最低限のメモリしか搭載していない場合、通常の環境に比べて、インストールに非常に時間がかかります。ただし、インストールが正常に完了すれば、利用する上ではあまり問題は起こりません。

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.

メモリの少ないシステムではDesktop CDを用いてインストールする場合は、「コンピュータに変更を加えずにUbuntuを使ってみる」を選択するのではなく、「Ubuntuをインストールする」をメニューで選択し、インストーラーだけを動作させると良いでしょう。

Installation

インストール

「推奨パッケージ」はデフォルトでインストールされます

In accordance with the Debian Policy Manual (which says "The 'Recommends' field should list packages that would be found together with this one in all but unusual installations"), the package management system now installs packages listed in the Recommends: field of other installed packages as well as Depends: by default. If you want to avoid this for specific packages, use apt-get --no-install-recommends; if you want to make this permanent, set APT::Install-Recommends "false"; in /etc/apt/apt.conf. Be aware that this may result in missing features in some programs.

Debianポリシーマニュアルに基づいて(Debianポリシーマニュアルには「'Recommends' フィールドには、特別な場合でないかぎり一緒に使用されるパッケージが書かれます」とあります)、デフォルトではパッケージマネジメントシステムが「Recommends:」に記述されたパッケージを、「Depends:」に書かれたものと同じようにインストールするようになりました。もし特定のパッケージでこの動作をさせたくない場合、「apt-get --no-install-recommends」を指定してください。また、常に設定するのであれば、「/etc/apt/apt.conf」に「APT::Install-Recommends "false";」を設定してください。ただし、この設定を行うと、一部のプログラムでは期待される機能の一部が使えなくなることがあります。

(This change was made in Ubuntu 8.10.)

(この変更はUbuntu8.10で行われました)

Upgrading

アップグレード

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.

Ubuntu8.10のユーザはUbuntu9.04へ便利な自動化された処理でアップグレードできます。古いUbuntuリリースのユーザは、まずUbuntu8.10へアップグレードを行ってから、9.04にアップグレードする必要があります。完全な手順は http://www.ubuntu.com/getubuntu/upgrading で確認することができます。

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.

Kubuntuのユーザは、Kubuntu8.04からKubuntu9.04へ直接アップグレードすることができます。この方法でのユーザアップグレードはrelease notes for Ubuntu 8.10が、ここで説明された問題が適用されるため、読んで確認したほうがよいでしょう。

Boot failures on systems with Intel D945 motherboards

Intel D945マザーボードでシステム上のブート失敗

Users have reported slower than normal detection of SATA hard drives on systems with Intel D945 motherboards in Ubuntu 9.04. This may cause the system to drop to a busybox initramfs shell on boot with a "Gave up waiting for root device." error. Wait a minute or two and then exit the initramfs shell by typing 'exit'. Booting should proceed normally. If it doesn't, wait a bit longer and try again. Once the system boots, edit /boot/grub/menu.lst and add rootdelay=90 to the kernel stanza for your current kernel. (Bug 290153).

Upgrades from beta may use LABEL= in /etc/fstab

ベータ版からのアップグレードは/etc/fstabでLABEL=が使われる

Systems installed using Jaunty Alpha 5, Jaunty Alpha 6, or the Ubuntu 9.04 beta may use LABEL= syntax in /etc/fstab to identify file systems. This may cause unexpected behaviour later if another disk (such as a USB drive) is added later containing file systems with clashing labels. Unless you are sure that this is what you intend, we recommend that you switch to using universally unique identifiers (UUIDs) instead.

For example, if a file system is identified as LABEL=home in /etc/fstab, you can find the UUID as follows:

blkid -o value -s UUID -l -t LABEL=home

You can then replace LABEL=home with UUID=output, where output is the output of blkid.

Systems installed using the release candidate or final release of Ubuntu 9.04 do not have this problem.

Upgrades from alphas may need re-encryption of encrypted home directories

アルファ版からのアップグレードは暗号化されたhomeディレクトリの再暗号化が必要になる

Users who were running eCryptfs on the Jaunty Alpha milestones are advised to re-encrypt any encrypted files. An upstream 2.6.28 kernel bug caused random kernel memory to be written to eCryptfs encrypted file headers. The fix has been applied and deployed to Ubuntu users in the Jaunty RC kernel. Ubuntu eCryptfs users running this kernel should re-encrypt each encrypted file using /usr/bin/ecryptfs-rewrite-file. For more information, please see ecryptfs-rewrite-file(1). See 345544.

Upgrades from Ubuntu 8.10 may have lilo installed

Ubuntu8.10からのアップグレードはliloがインストールされる

Ubuntu 8.10 systems installed from the desktop CD mistakenly had the lilo package installed as well as grub, although grub was used for booting. If you use the recommended Update Manager upgrade method, then the lilo package will be removed if it does not appear to be used. If you upgrade using some other method and are sure that you only use the GRUB boot loader, then we recommend that you remove the lilo package manually. Bug 314004

Setting wireless regulatory domain via module option no longer supported

モジュールオプション経由でのワイヤレス設定調整領域はすでにサポートされません

Ubuntu 9.04 enables the CRDA wireless regulatory framework for controlling which wireless channels are usable and visible in a particular location. If you previously had to use the module option similar to that below in /etc/modprobe.d/options to allow access to certain channels in your locality then you may find that wireless will not function at all:

  • options cfg80211 ieee80211_regdom=EU

You should remove this kernel module option on upgrade to Ubuntu 9.04 and use the iw reg command instead.

Network management applet must be re-added on Kubuntu upgrade

Network managementアプレットはKubuntuアップグレードで再度追加する必要があります

When upgrading from Kubuntu 8.10, the new Network Management applet will need to be added to the panel manually. (Bug 349066)

Click the Plasma icon in the bottom right.

Click Add Widget.

Double click on Network Management.

Kubuntu Network Management applet does not connect to WPA2 networks

Kubuntu Network ManagementアプレットはWPA2ネットワークに接続できません

The Network Management applet in Kubuntu does not connect to WPA 2 network or some VPN setups. You can use knetworkmanager (available on the DVD) or network-manager-gnome as a workaround. Bug 339313

Ctrl-Alt-Backspace disabled by default in Xorg

XorgではデフォルトでCtrl-Alt-Backspaceが無効にされています

The Ctrl-Alt-Backspace key combination to force a restart of X is now disabled by default, to eliminate the problem of accidentally triggering the key combination. Users who do want this function can enable it in their xorg.conf, or by running the command dontzap --disable.

Change in notifications of available updates

利用可能なアップデータの通知における変更

Ubuntu 9.04 introduces a change to the handling of package updates, launching update-manager directly instead of displaying a notification icon in the GNOME panel. Users will still be notified of security updates on a daily basis, but for updates that are not security-related, users will only be prompted once a week.

Users who wish to continue receiving update notifications in the previous manner can restore the earlier behavior using the following command:

gconftool -s --type bool /apps/update-notifier/auto_launch false

Other known issues

その他の不具合

Performance regressions on Intel graphics cards

Intelグラフィックカードの性能が悪くなっています

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".

    Warning /!\ 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.

Display freezes with Intel graphics cards

Intelグラフィックカードで表示がフリーズする

Users of Intel video chipsets reported that the display freezes a few minutes after resuming from suspend or hibernate (bug 339091), or under other circumstances (bug 359392). In many cases, switching off desktop effects in System → Preferences → Appearance was reported to help.

If it still happens without desktop effects, you can add Option "DRI" "off" to the Device section of /etc/X11/xorg.conf, as described above. This will disable 3D acceleration and desktop effects, but makes suspend work reliably again and also avoid many types of crashes.

Lock-ups when deleting files from ext4 filesystems

ext4ファイルシステムからファイルを削除するとき動かなくなる

In some cases, deleting files from an ext4 filesystem is reported to cause soft lock-ups in the kernel (330824). Investigation of this problem is ongoing, and it is expected that a fix for this problem will be made available as a post-release update. To avoid this problem, users may wish to install using the default ext3 filesystem and convert their filesystem to ext4 (as documented on the ext4 wiki) once a fix is available.

Switching to ext4 requires manually updating grub

ext4に切り替える場合は手動でgrubのアップデートが必要です

If you choose to upgrade your / or /boot filesystem in place from ext2 or ext3 to ext4 (as documented on the ext4 wiki), then you must also use the grub-install command after upgrading to Ubuntu 9.04 to reinstall your boot loader. If you do not do this, then the version of GRUB installed in your boot sector will not be able to read the kernel from the ext4 filesystem and your system will fail to boot.

Occasional hangs possible on ARM architecture

ARMアーキテクチャでしばしばハングする可能性がある

The ARM port currently does not support the ppoll() & pselect() system syscalls, which will sometimes cause a failure to mount the root filesystem on boot. This is a race condition, and retrying the boot will usually clear the problem. The work to add the syscalls is currently underway and will be delivered as an update to the Ubuntu 9.04 kernel some time after release.