sudo apt-get update当我从默认实时 USB 会话（Ubuntu Desktop 17.10）运行时，为什么会出现此错误？
Ign:1 cdrom://Ubuntu 17.10 _Artful Aardvark_ - Release amd64 (20180105.1) artful InRelease
Hit:2 cdrom://Ubuntu 17.10 _Artful Aardvark_ - Release amd64 (20180105.1) artful Release
Hit:3 http://archive.ubuntu.com/ubuntu artful InRelease
Hit:4 http://security.ubuntu.com/ubuntu artful-security InRelease
Hit:5 http://archive.ubuntu.com/ubuntu artful-updates InRelease
Get:7 http://archive.ubuntu.com/ubuntu artful/main Translation-en_GB [71.1 kB]
Get:8 http://archive.ubuntu.com/ubuntu artful/restricted Translation-en_GB [2,464 B]
Fetched 73.6 kB in 0s (216 kB/s)
Reading package lists... Done
W: chown to _apt:root of file /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_artful_InRelease failed - Item::QueueURI (95: Operation not supported)
W: chmod 0600 of file /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_artful_InRelease failed - Item::QueueURI (95: Operation not supported)
W: chown to root:root of file /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_artful_InRelease failed - 201::URIDone (95: Operation not supported)
W: chmod 0644 of file /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_artful_InRelease failed - 201::URIDone (95: Operation not supported)
当我运行时ls -al /var/lib/apt/lists/，它显示
ubuntu@ubuntu:~$ ls -al /var/lib/apt/lists/
total 12285
drwxr-xr-x 1 root root 140 Feb 14 21:57 .
drwxr-xr-x 1 root root 80 Feb 14 21:57 ..
-rw-r--r-- 1 root root 236651 Oct 19 12:56 archive.ubuntu.com_ubuntu_dists_artful_InRelease
-rw-r--r-- 1 root root 6681096 Oct 19 12:56 archive.ubuntu.com_ubuntu_dists_artful_main_binary-amd64_Packages
-rw-r--r-- 1 root root 3402759 Oct 16 10:08 archive.ubuntu.com_ubuntu_dists_artful_main_i18n_Translation-en
-rw-r--r-- 1 root root 110861 Oct 19 12:56 archive.ubuntu.com_ubuntu_dists_artful_restricted_binary-amd64_Packages
-rw-r--r-- 1 root root 18974 Oct 13 11:12 archive.ubuntu.com_ubuntu_dists_artful_restricted_i18n_Translation-en
-rw-r--r-- 1 root root 78587 Jan 5 20:32 archive.ubuntu.com_ubuntu_dists_artful-updates_InRelease
-rw-r--r-- 1 root root 866650 Jan 5 18:44 archive.ubuntu.com_ubuntu_dists_artful-updates_main_binary-amd64_Packages
-rw-r--r-- 1 root root 462155 Jan 5 06:05 archive.ubuntu.com_ubuntu_dists_artful-updates_main_i18n_Translation-en
-rw-r--r-- 1 root root 19723 Nov 10 14:56 archive.ubuntu.com_ubuntu_dists_artful-updates_restricted_binary-amd64_Packages
-rw-r--r-- 1 root root 3724 Nov 8 21:27 archive.ubuntu.com_ubuntu_dists_artful-updates_restricted_i18n_Translation-en
-rw-r----- 1 root root 0 Jan 5 20:35 lock
drwx------ 1 _apt root 40 Feb 14 21:57 partial
-rw-r--r-- 1 root root 78589 Jan 5 20:32 security.ubuntu.com_ubuntu_dists_artful-security_InRelease
-rw-r--r-- 1 root root 347191 Jan 5 11:18 security.ubuntu.com_ubuntu_dists_artful-security_main_binary-amd64_Packages
-rw-r--r-- 1 root root 202149 Jan 4 16:16 security.ubuntu.com_ubuntu_dists_artful-security_main_i18n_Translation-en
-rw-r--r-- 1 root root 48945 Feb 14 21:57 Ubuntu%2017.10%20%5fArtful%20Aardvark%5f%20-%20Release%20amd64%20(20180105.1)_dists_artful_main_binary-amd64_Packages
-rw-r--r-- 1 root root 3355 Feb 14 21:57 Ubuntu%2017.10%20%5fArtful%20Aardvark%5f%20-%20Release%20amd64%20(20180105.1)_dists_artful_Release
-rw-r--r-- 1 root root 819 Feb 14 21:57 Ubuntu%2017.10%20%5fArtful%20Aardvark%5f%20-%20Release%20amd64%20(20180105.1)_dists_artful_Release.gpg
-rw-r--r-- 1 root root 4629 Feb 14 21:57 Ubuntu%2017.10%20%5fArtful%20Aardvark%5f%20-%20Release%20amd64%20(20180105.1)_dists_artful_restricted_binary-amd64_Packages
返回的存在代码为 100（由 给出echo $?），表示出现错误。
我认为这对我来说是个问题，因为下一个命令也失败了。我在运行时apt-get install some-package-i-wanted收到错误“无法找到包”。所以我假设第一个错误是根本原因。然而，事实证明该包在 17.10 版的默认存储库中不可用。
我通过从相关网站手动下载并安装 .deb 包解决了这个问题。
但仍然有兴趣了解原始错误消息的含义。