更新archlinux

有个上网本，虽然配置很差，但是安装的是arch，这不长时间不滚动更新出问题了，

 :: Proceed with installation? [Y/n]
 (/) checking keys in keyring                                                      [##################################################] %
 (/) checking package integrity                                                    [##################################################] %
 error: jasper: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
 :: File /var/cache/pacman/pkg/jasper-2.0.--x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
 Do you want to delete it? [Y/n] n
 error: krb5: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
 :: File /var/cache/pacman/pkg/krb5-1.13.--x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
 Do you want to delete it? [Y/n] n
 error: libpsl: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
 :: File /var/cache/pacman/pkg/libpsl-0.16.--x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
 Do you want to delete it? [Y/n] n
 error: libwmf: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
 :: File /var/cache/pacman/pkg/libwmf-0.2.8.4--x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
 Do you want to delete it? [Y/n] n
 error: shutter: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
 :: File /var/cache/pacman/pkg/shutter-0.93.--any.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
 Do you want to delete it? [Y/n] n
 error: failed to commit transaction (invalid or corrupted package)
 Errors occurred, no packages were upgraded.

百度关键词signature from   archlinux

百度贴吧的解决方法是

 # pacman-key --init
 # pacman-key --populate

失败

想通过卸载的方式结果

 [local1@lqspc ~]$ sudo pacman -Rcn jasper
 checking dependencies...
 :: avahi optionally requires gtk3: avahi-discover-standalone, bshell, bssh, bvnc
 :: avahi optionally requires gtk2: gtk2 bindings
 :: avahi optionally requires pygtk: avahi-bookmarks, avahi-discover
 :: gegl02 optionally requires librsvg: svg plugin
 :: gegl02 optionally requires jasper: jasper plugin
 :: imagemagick optionally requires ghostscript: for Ghostscript support
 :: imagemagick optionally requires librsvg: for SVG support
 :: libwmf optionally requires gdk-pixbuf2: for pixbuf loader
 :: lxde-common optionally requires lxde-icon-theme: default icon theme
 :: pinentry optionally requires gtk2: gtk2 backend
 :: pinentry optionally requires gcr: gnome3 backend
 :: xdg-utils optionally requires libgnome: for GNOME support in xdg-open
 :: xdg-utils optionally requires pcmanfm: for LXDE support in xdg-open

 Packages () adwaita-icon-theme-3.20-  bluefish-2.2.-  chromium-53.0.2785.116-  emacs-25.1-  evince-3.20.-  fcitx-4.2.9.1-
               fcitx-gtk2-4.2.9.1-  fcitx-gtk3-4.2.9.1-  fcitx-qt4-4.2.9.1-  file-roller-3.20.-  flashplugin-11.2.202.635-  gcr-3.20.-
               gdk-pixbuf2-2.34.-  gedit-3.20.-  ghostscript-9.19-  gnome-desktop-:3.20.-  gnome-perl-1.045-  gnome-vfs-perl-1.082-
               gnomecanvas-perl-1.002-  goocanvas1-1.0.-  gpicview-0.2.-  gspell-1.0.-  gtk-engines-2.21.-
               gtk-update-icon-cache-3.20.-  gtk2-2.24.-  gtk2-perl-1.2498-  gtk3-3.20.-  gtkimageview-1.6.-  gtksourceview3-3.20.-
               gvfs-1.28.-  libbonoboui-2.24.-  libfm-gtk2-1.2.-  libglade-2.6.-  libgnome-2.32.-  libgnomecanvas-2.30.-
               libgnomeui-2.24.-  libkeybinder2-0.3.-  libnotify-0.7.-  libpeas-1.18.-  librsvg-:2.40.-  libspectre-0.2.-
               libunique-1.1.-  libwnck-2.31.-  lxappearance-0.6.-  lxappearance-obconf-0.2.-  lxde-icon-theme-0.5.-  lxdm-0.5.-
               lxinput-0.3.-  lxlauncher-0.2.-  lxmusic-0.4.-  lxpanel-0.8.-  lxrandr-0.3.-  lxsession-:0.5.-  lxtask-0.1.-
               lxterminal-0.2.-  network-manager-applet-1.4.-  nm-connection-editor-1.4.-  obconf-2.0.-  openbox-3.6.-  pcmanfm-1.2.-
               perl-gnome2-wnck-0.16-  perl-goo-canvas-0.06-  perl-gtk2-imageview-0.05-  perl-gtk2-unique-0.05-  pygtk-2.24.-
               shutter-0.93.-  vte-0.28.-  jasper-1.900.-

 Total Removed Size:  678.11 MiB

 :: Do you want to remove these packages? [Y/n] n

查看wiki看到

Signature from "User <email@gmail.com>" is unknown trust, installation failed
查看pacman-key#Resetting all the keys. 或试试：
更新已知密钥：pacman-key --refresh-keys;
手动升级archlinux-keyring软件包：pacman -S archlinux-keyring.

这么做了之后，好像报错变了，也许不是这么做导致的，无论如何，下面的新错误是

 Total Installed Size:  1787.46 MiB
 Net Upgrade Size:        37.77 MiB

 :: Proceed with installation? [Y/n]
 (/) checking keys in keyring                                                      [##################################################] %
 (/) checking package integrity                                                    [##################################################] %
 (/) loading package files                                                         [##################################################] %
 (/) checking for file conflicts                                                   [##################################################] %
 error: failed to commit transaction (conflicting files)
 ttf-dejavu: /etc/fonts/conf.d/-unhint-small-dejavu-sans-mono.conf exists in filesystem
 ttf-dejavu: /etc/fonts/conf.d/-unhint-small-dejavu-sans.conf exists in filesystem
 ttf-dejavu: /etc/fonts/conf.d/-unhint-small-dejavu-serif.conf exists in filesystem
 ttf-dejavu: /etc/fonts/conf.d/-dejavu-sans-mono.conf exists in filesystem
 ttf-dejavu: /etc/fonts/conf.d/-dejavu-sans.conf exists in filesystem
 ttf-dejavu: /etc/fonts/conf.d/-dejavu-serif.conf exists in filesystem
 Errors occurred, no packages were upgraded.

之后又测试了先更新tzdata，然后更新pacman，发现pacman并没有新版本更新，结果依然如此，那么就采取了强制更新。 正在解决的方案，突然发现有人提到了强制更新，

进展如下

 extra/xproto                         7.0.-                   7.0.-                     0.00 MiB
 extra/xterm                          -                      -                        0.00 MiB
 core/xz                              5.2.-                    5.2.-                      0.00 MiB
 core/zlib                            1.2.-                    :1.2.-                    0.00 MiB

 Total Installed Size:  1785.65 MiB
 Net Upgrade Size:        37.76 MiB

 :: Proceed with installation? [Y/n]
 (/) checking keys in keyring                                                      [##################################################] %
 (/) checking package integrity                                                    [##################################################] %
 (/) loading package files                                                         [##################################################] %
 (/) checking for file conflicts                                                   [##################################################] %
 (/) checking available disk space                                                 [##################################################] %
 :: Processing package changes...
 (/) removing fuse                                                                     [##################################################] %
 (  /) upgrading iana-etc                                                            [##################################################] %
 (  /) upgrading attr                                                                [##################################################] %
 (  /) upgrading acl                                                                 [##################################################] %
 (  /) upgrading ncurses                                                             [##################################################] %
 (  /) upgrading readline                                                            [##################################################] %
 (  /) upgrading zlib                                                                [##################################################] %
 (  /) upgrading bash                                                                [##################################################] %