我正在尝试升级到最新的 Ubuntu 版本，并且想要测试 Unity 8。当我执行以下命令时：
sudo apt-get update && sudo apt-get dist-upgrade
这，
sudo apt-get update --fix-missing
我收到以下错误：
Reading package lists... Done
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_atareao_atareao_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key A3D8A366869FE2DC5FFD79C36A9653F936FD5529 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_docky-core_stable_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 53BD7760A5A09E78FC8649D9608BF7B93528AE20 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_nilarimogard_webupd8_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 1DB29AFFF6C70907B57AA31F531EE72F4C9D234C (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_noobslab_apps_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 4FA44A478284A18C1BA4A9CAD530E028F59EAE4D (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_rvm_smplayer_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key E23A3C5344AE497C2FEE7B0BA7E13D78E4A4F4F4 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_team-xbmc_ppa_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 189701DA570C56B9488EF60A6D975C4791E7EE5E (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_teejee2008_ppa_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 1B32B87ABAEE357218F6B48CB5B116B72D0F61F0 (weak digest)
W: gpgv:/var/lib/apt/lists/dl.google.com_linux_chrome_deb_dists_stable_Release.gpg: The repository is insufficiently signed by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 (weak digest)
W: gpgv:/var/lib/apt/lists/dl.google.com_linux_talkplugin_deb_dists_stable_Release.gpg: The repository is insufficiently signed by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 (weak digest)
W: gpgv:/var/lib/apt/lists/dl.google.com_linux_webdesigner_deb_dists_stable_Release.gpg: The repository is insufficiently signed by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 (weak digest)
W: Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/Release No Hash entry in Release file /var/lib/apt/lists/dl.google.com_linux_talkplugin_deb_dists_stable_Release, which is considered strong enough for security purposes
W: Failed to fetch http://dl.google.com/linux/webdesigner/deb/dists/stable/Release No Hash entry in Release file /var/lib/apt/lists/dl.google.com_linux_webdesigner_deb_dists_stable_Release, which is considered strong enough for security purposes
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/main/binary-i386/Packages.xz Hash Sum mismatch
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-amd64/Packages.bz2 Hash Sum mismatch
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-i386/Packages Error writing to output file - write (28: No space left on device) [IP: 91.189.91.23 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/universe/i18n/Translation-en.xz Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.
答案1
您当然可以按照前面所述升级到 16.04，但建议在升级到新版本的操作系统时禁用任何第三方存储库。此外，要升级版本，命令是“sudo do-release-upgrade -d”，其中使用 -d 是因为它仍在开发中，仅在更新和 dist-upgrade 命令之后使用。希望对您有所帮助。