我正在尝试从 14.04 LTS 升级到 14.10。使用自动更新时，在“设置新软件频道”步骤失败。/var/log/dist-update/ 日志文件中显示失败的行如下：
2015-05-20 17:28:44,010 DEBUG doPostInitialUpdate
2015-05-20 17:28:44,011 DEBUG plugins for condition 'PostInitialUpdate' are '[]'
2015-05-20 17:28:44,011 DEBUG plugins for condition 'utopicPostInitialUpdate' are '[]'
2015-05-20 17:28:44,011 DEBUG plugins for condition 'from_trustyPostInitialUpdate' are '[]'
2015-05-20 17:29:02,898 DEBUG Foreign: google-chrome-stable
2015-05-20 17:29:02,898 DEBUG Obsolete: gs-cjk-resource language-support-en language-support-writing-en linux-image-2.6.32-21-generic linux-image-3.2.0-67-generic
2015-05-20 17:29:02,901 DEBUG updateSourcesList()
2015-05-20 17:29:03,254 DEBUG rewriteSourcesList()
2015-05-20 17:29:03,264 DEBUG examining: 'deb ://us.archive.ubuntu.com/ubuntu/ trusty main restricted'
2015-05-20 17:29:03,265 DEBUG entry 'deb ://us.archive.ubuntu.com/ubuntu/ utopic main restricted' updated to new dist
2015-05-20 17:29:03,266 DEBUG examining: 'deb-src ://us.archive.ubuntu.com/ubuntu/ trusty main restricted'
2015-05-20 17:29:03,266 DEBUG entry 'deb-src ://us.archive.ubuntu.com/ubuntu/ utopic main restricted' updated to new dist
2015-05-20 17:29:03,267 DEBUG examining: 'deb ://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted'
2015-05-20 17:29:03,267 DEBUG entry 'deb ://us.archive.ubuntu.com/ubuntu/ utopic-updates main restricted' updated to new dist
2015-05-20 17:29:03,268 DEBUG examining: 'deb-src ://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted'
2015-05-20 17:29:03,269 DEBUG entry 'deb-src ://us.archive.ubuntu.com/ubuntu/ utopic-updates main restricted' updated to new dist
2015-05-20 17:29:03,269 DEBUG examining: 'deb ://us.archive.ubuntu.com/ubuntu/ trusty universe'
2015-05-20 17:29:03,270 DEBUG entry 'deb ://us.archive.ubuntu.com/ubuntu/ utopic universe' updated to new dist
2015-05-20 17:29:03,270 DEBUG examining: 'deb-src ://us.archive.ubuntu.com/ubuntu/ trusty universe'
2015-05-20 17:29:03,271 DEBUG entry 'deb-src ://us.archive.ubuntu.com/ubuntu/ utopic universe' updated to new dist
2015-05-20 17:29:03,271 DEBUG examining: 'deb ://us.archive.ubuntu.com/ubuntu/ trusty-updates universe'
2015-05-20 17:29:03,272 DEBUG entry 'deb //us.archive.ubuntu.com/ubuntu/ utopic-updates universe' updated to new dist
2015-05-20 17:29:03,273 DEBUG examining: 'deb-src ://us.archive.ubuntu.com/ubuntu/ trusty-updates universe'
2015-05-20 17:29:03,273 DEBUG entry 'deb-src //us.archive.ubuntu.com/ubuntu/ utopic-updates universe' updated to new dist
2015-05-20 17:29:03,274 DEBUG examining: 'deb ://us.archive.ubuntu.com/ubuntu/ trusty multiverse'
2015-05-20 17:29:03,274 DEBUG entry 'deb ://us.archive.ubuntu.com/ubuntu/ utopic multiverse' updated to new dist
2015-05-20 17:29:03,275 DEBUG examining: 'deb-src ://us.archive.ubuntu.com/ubuntu/ trusty multiverse'
2015-05-20 17:29:03,276 DEBUG entry 'deb-src ://us.archive.ubuntu.com/ubuntu/ utopic multiverse' updated to new dist
2015-05-20 17:29:03,276 DEBUG examining: 'deb ://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse'
2015-05-20 17:29:03,277 DEBUG entry 'deb ://us.archive.ubuntu.com/ubuntu/ utopic-updates multiverse' updated to new dist
2015-05-20 17:29:03,277 DEBUG examining: 'deb-src ://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse'
2015-05-20 17:29:03,278 DEBUG entry 'deb-src ://us.archive.ubuntu.com/ubuntu/ utopic-updates multiverse' updated to new dist
2015-05-20 17:29:03,278 DEBUG examining: 'deb ://security.ubuntu.com/ubuntu trusty-security main restricted'
2015-05-20 17:29:03,279 DEBUG entry 'deb ://security.ubuntu.com/ubuntu utopic-security main restricted' updated to new dist
2015-05-20 17:29:03,280 DEBUG examining: 'deb-src ://security.ubuntu.com/ubuntu trusty-security main restricted'
2015-05-20 17:29:03,280 DEBUG entry 'deb-src ://security.ubuntu.com/ubuntu utopic-security main restricted' updated to new dist
2015-05-20 17:29:03,281 DEBUG examining: 'deb ://security.ubuntu.com/ubuntu trusty-security universe'
2015-05-20 17:29:03,281 DEBUG entry 'deb ://security.ubuntu.com/ubuntu utopic-security universe' updated to new dist
2015-05-20 17:29:03,282 DEBUG examining: 'deb-src ://security.ubuntu.com/ubuntu trusty-security universe'
2015-05-20 17:29:03,282 DEBUG entry 'deb-src ://security.ubuntu.com/ubuntu utopic-security universe' updated to new dist
2015-05-20 17:29:03,283 DEBUG examining: 'deb ://security.ubuntu.com/ubuntu trusty-security multiverse'
2015-05-20 17:29:03,284 DEBUG entry 'deb ://security.ubuntu.com/ubuntu utopic-security multiverse' updated to new dist
2015-05-20 17:29:03,284 DEBUG examining: 'deb-src ://security.ubuntu.com/ubuntu trusty-security multiverse'
2015-05-20 17:29:03,285 DEBUG entry 'deb-src ://security.ubuntu.com/ubuntu utopic-security multiverse' updated to new dist
2015-05-20 17:29:03,285 DEBUG examining: 'deb ://us.archive.ubuntu.com/ubuntu/ trusty-proposed universe main multiverse restricted'
2015-05-20 17:29:03,286 DEBUG entry 'deb ://us.archive.ubuntu.com/ubuntu/ utopic-proposed universe main multiverse restricted' updated to new dist
2015-05-20 17:29:03,286 DEBUG examining: 'deb ://dl.google.com/linux/chrome/deb/ stable main'
2015-05-20 17:29:03,300 DEBUG entry '# deb ://dl.google.com/linux/chrome/deb/ stable main # disabled on upgrade to utopic' was disabled (unknown mirror)
2015-05-20 17:29:07,974 DEBUG running doUpdate() (showErrors=True)
2015-05-20 17:30:21,916 DEBUG openCache()
2015-05-20 17:30:21,917 DEBUG failed to SystemUnLock() (E:Not locked)
2015-05-20 17:30:32,502 DEBUG /openCache(), new cache size 47187
2015-05-20 17:30:32,503 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2015-05-20 17:33:24,486 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'
2015-05-20 17:33:24,487 DEBUG abort called
2015-05-20 17:33:24,491 DEBUG openCache()
2015-05-20 17:33:35,942 DEBUG /openCache(), new cache size 45865
2015-05-20 17:33:35,961 DEBUG enabling apt cron job
这是 cat /etc/apt/source.list 的输出。
> # deb cdrom:[Ubuntu 10.04 LTS _Lucid Lynx_ - Release i386 (20100429)]/ lucid main restricted
> # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
> # newer versions of the distribution.
>
> deb http://us.archive.ubuntu.com/ubuntu/ trusty main restricted
> deb-src http://us.archive.ubuntu.com/ubuntu/ trusty main restricted
>
> ## Major bug fix updates produced after the final release of the
> ## distribution.
> deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
> deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
>
> ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
> ## team. Also, please note that software in universe WILL NOT receive any
> ## review or updates from the Ubuntu security team.
> deb http://us.archive.ubuntu.com/ubuntu/ trusty universe
> deb-src http://us.archive.ubuntu.com/ubuntu/ trusty universe
> deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
> deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
>
> ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
> ## team, and may not be under a free licence. Please satisfy yourself as to
> ## your rights to use the software. Also, please note that software in
> ## multiverse WILL NOT receive any review or updates from the Ubuntu
> ## security team.
> deb http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
> deb-src http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
> deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
> deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
>
> ## Uncomment the following two lines to add software from the 'backports'
> ## repository.
> ## N.B. software from this repository may not have been tested as
> ## extensively as that contained in the main release, although it includes
> ## newer versions of some applications which may provide useful features.
> ## Also, please note that software in backports WILL NOT receive any review
> ## or updates from the Ubuntu security team.
> # deb http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
> # deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
> # deb http://cran.wustl.edu/bin/linux/ubuntu precise/ # disabled on upgrade to trusty
>
> ## Uncomment the following two lines to add software from Canonical's
> ## 'partner' repository.
> ## This software is not part of Ubuntu, but is offered by Canonical and the
> ## respective vendors as a service to Ubuntu users.
> # deb http://archive.canonical.com/ubuntu lucid partner
> # deb-src http://archive.canonical.com/ubuntu lucid partner
>
> deb http://security.ubuntu.com/ubuntu trusty-security main restricted
> deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
> deb http://security.ubuntu.com/ubuntu trusty-security universe
> deb-src http://security.ubuntu.com/ubuntu trusty-security universe
> deb http://security.ubuntu.com/ubuntu trusty-security multiverse
> deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse
> deb http://us.archive.ubuntu.com/ubuntu/ trusty-proposed universe main multiverse restricted
这是 ls /etc/apt/sources.list.d 文件的输出。
-rw-r--r-- 1 176 May 20 17:29 google-chrome.list.distUpgrade
-rw-r--r-- 1 176 Apr 29 20:46 google-chrome.list.save
谢谢