请教如何解决？
[archuser@archlinux ~]$ sudo pacman -Syu
[sudo] password for archuser:
:: Synchronizing package databases...
core is up to date
extra 8.2 MiB 118 KiB/s 01:11 [######################################] 100%
community is up to date
multilib is up to date
archlinuxcn 3.4 MiB 720 KiB/s 00:05 [######################################] 100%
archlinuxfr.db failed to download
error: failed retrieving file 'archlinuxfr.db' from repo.archlinux.fr : The requested URL returned error: 404
error: failed to synchronize all databases (failed to retrieve some files)
离线
archlinuxfr这个软件源已经没有了，你要把/etc/pacman.conf里面的相关内容删掉。另外community和extra合并了，你可以把community删掉。
删除后再更新系统。
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已删archlinuxfr后更新如下 ：
[archuser@archlinux ~]$ sudo pacman -Syu
:: Synchronizing package databases...
error: failed to synchronize all databases (no servers configured for repository)
该如何解决？
离线
？？没有配置服务器。
你不妨把你的pacman.conf用一个pastebin沾上来，看看是什么问题。
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#
# /etc/pacman.conf
#
# See the pacman.conf(5) manpage for option and repository directives
#
# GENERAL OPTIONS
#
[options]
# The following paths are commented out with their default values listed.
# If you wish to use different paths, uncomment and update the paths.
#RootDir = /
#DBPath = /var/lib/pacman/
#CacheDir = /var/cache/pacman/pkg/
#LogFile = /var/log/pacman.log
#GPGDir = /etc/pacman.d/gnupg/
#HookDir = /etc/pacman.d/hooks/
HoldPkg = pacman glibc
#XferCommand = /usr/bin/curl -L -C - -f -o %o %u
#XferCommand = /usr/bin/wget --passive-ftp -c -O %o %u
#CleanMethod = KeepInstalled
Architecture = auto
# Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
#IgnorePkg =
#IgnoreGroup =
#NoUpgrade =
#NoExtract =
# Misc options
#UseSyslog
#Color
#NoProgressBar
CheckSpace
#VerbosePkgLists
#ParallelDownloads = 5
# By default, pacman accepts packages signed by keys that its local keyring
# trusts (see pacman-key and its man page), as well as unsigned packages.
SigLevel = Required DatabaseOptional
LocalFileSigLevel = Optional
#RemoteFileSigLevel = Required
# NOTE: You must run `pacman-key --init` before first using pacman; the local
# keyring can then be populated with the keys of all official Arch Linux
# packagers with `pacman-key --populate archlinux`.
#
# REPOSITORIES
# - can be defined here or included from another file
# - pacman will search repositories in the order defined here
# - local/custom mirrors can be added here or in separate files
# - repositories listed first will take precedence when packages
# have identical names, regardless of version number
# - URLs will have $repo replaced by the name of the current repo
# - URLs will have $arch replaced by the name of the architecture
#
# Repository entries are of the format:
# [repo-name]
# Server = ServerName
# Include = IncludePath
#
# The header [repo-name] is crucial - it must be present and
# uncommented to enable the repo.
#
# The testing repositories are disabled by default. To enable, uncomment the
# repo name header and Include lines. You can add preferred servers immediately
# after the header, and they will be used before the default mirrors.
#[testing]
#Include = /etc/pacman.d/mirrorlist
[core]
Include = /etc/pacman.d/mirrorlist
[extra]
Include = /etc/pacman.d/mirrorlist
#[community-testing]
#Include = /etc/pacman.d/mirrorlist
[community]
#Include = /etc/pacman.d/mirrorlist
# If you want to run 32 bit applications on your x86_64 system,
# enable the multilib repositories as required here.
#[multilib-testing]
#Include = /etc/pacman.d/mirrorlist
[multilib]
Include = /etc/pacman.d/mirrorlist
# An example of a custom package repository. See the pacman manpage for
# tips on creating your own repositories.
#[custom]
#SigLevel = Optional TrustAll
#Server = file:///home/custompkgs
[archlinuxcn]
SigLevel = Optional TrustAll
#Server = https://repo.archlinuxcn.org/$arch
#Server = https://mirrors.163.com/archlinux-cn/$arch
#Server = https://repo.huaweicloud.com/archlinux/$repo/os/$arch
Server = https://mirrors.tuna.tsinghua.edu.cn/archlinuxcn/$arch
Server = https://mirrors.ustc.edu.cn/archlinuxcn/$arch
[archlinuxfr]
#SigLevel = Never
#Server = https://repo.archlinux.fr/$arch
离线
你要把 [archlinuxfr] 注释掉，或者直接把那一块删掉才可以。
在线