ReleaseNotes

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''' ** TO DO: Update these for Maverick Meerkat - content is still Lucid's ** ''' ''' ** TO DO: Update these for Maverick Meerkat - content only contains carry-over from Lucid ** '''

** TO DO: Update these for Maverick Meerkat - content only contains carry-over from Lucid **

These release notes document known issues with Ubuntu 10.10 and its variants.

Release Overview

TO DO: move content from Technical Overview to here, and doublecheck against press release messages.

System Requirements

The minimum memory requirement for Ubuntu 10.10 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, or may be able to use the alternate install CD.

Release notes for Ubuntu 10.10 for ARM

A separate page has been made available with release notes for the developer-oriented Ubuntu 10.10 armel port. Please see https://wiki.ubuntu.com/ARM/MaverickReleaseNotes for information about issues affecting installation on ARM.

TO DO: Get Release notes for UEC from TTX

Installation

Hibernation may be unavailable with automatic partitioning

The default partitioning recipe in the installer will in some cases allocate a swap partition that is smaller than the physical memory in the system. This will prevent the use of hibernation (suspend-to-disk) because the system image will not fit in the swap partition. If you intend to use hibernation with your system, you should ensure that the swap partition's size is at least as large as the system's physical RAM. (345126)

I/O error after CD is ejected at end of install

In some cases, ejecting the CD at the end of installation will leave errors on the screen such as:

end_request: I/O error, dev sr0, sector 437628

these error messages indicate that the system is still trying to access some files on the CD, and are harmless except that they obscure the message asking the user to press Enter to reboot. You can safely remove the CD from the tray and press Enter at this point to reboot to your new Ubuntu system. (539027)

Upgrading

Users of Ubuntu 10.04LTS can upgrade to Ubuntu 10.10 by a convenient automated process. Users of other Ubuntu releases need to upgrade first to 10.04LTS, and then to 10.10. Complete instructions may be found at http://www.ubuntu.com/getubuntu/upgrading.

GDM does not support XDMCP

The version of gdm included in Ubuntu 10.04 LTS does not support the XDMCP protocol for remote graphical logins. Users who require XDMCP support will need to install another display manager, such as wdm or xdm, for this functionality. (408417)

Other known issues

*** MOVE TO SEPARATE PAGE -- insert link ***

Performance regressions with ext4 under certain workloads

The default file system for installations of Ubuntu 10.04 LTS is ext4, the latest version in the popular series of Linux extended file systems. ext4 includes a number of performance tuning changes relative to previous versions such as ext3, the file system used by default up to Ubuntu 9.04. These generally produce improvements, but some particular workloads are known to be significantly slower when using ext4 than when using ext3. If you have performance-sensitive applications, we recommend that you run benchmarks using multiple file systems in your environment and select the most appropriate.

Upstart jobs cannot be run in a chroot

Upstart jobs cannot be started in a chroot because upstart acts as a service supervisor, and processes within the chroot are unable to communicate with the upstart running outside of the chroot (430224). This will cause some packages that have been converted to use upstart jobs instead of init scripts to fail to upgrade within a chroot. Users are advised to configure their chroots with /sbin/initctl pointing to /bin/true, with the following commands run within the chroot:

dpkg-divert --local --rename --add /sbin/initctl
ln -s /bin/true /sbin/initctl

Use of degraded RAID 1 array may cause data loss in exceptional cases

If each member of a RAID 1 array is separately brought up in degraded mode across subsequent runs of the array with no reassembly in between, there is a risk that the disks will be reported as in sync when they are not, resulting in data loss due to inconsistencies between the data that has been written to each member. This is an unlikely occurrence during normal operations, but admins of systems using RAID 1 arrays should take care during maintenance to avoid this situation. (557429)

Avahi will always start even if a .local domain is present

The avahi-daemon package, which implements the mDNS "zeroconf" standard, formerly included a check to avoid running when a conflicting .local DNS domain is present, as it was reported that some ISPs advertise such a .local domain on their networks, leaving Ubuntu hosts unable to see names advertised on the local network (327362). In Ubuntu 9.10, avahi-daemon is started regardless.

It is possible that this may cause other problems. If your network is configured this way, you can disable mDNS using the following command:

sudo stop avahi-daemon
sudo sed -e '/^start/,+1s/^/#/' /etc/init/avahi-daemon.conf

NSS resolution breaks with LDAP over SSL in Ubuntu Server

Upgrading systems configured to use LDAP via SSL as the first service in the NSS stack (in /etc/nsswitch.conf) leads to broken NSS resolution afterwards such that setuid applications like sudo would stop working. To work around this, switch to the libnss-ldapd package instead of libnss-ldap before the upgrade, or use nscd. (423252)

MaverickMeerkat/ReleaseNotes (last edited 2011-01-20 20:58:02 by 99-156-85-10)