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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，
1 :: Proceed with installation? [Y/n]
2 (247/247) checking keys in keyring [##################################################] 100%
3 (247/247) checking package integrity [##################################################] 100%
4 error: jasper: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
5 :: File /var/cache/pacman/pkg/jasper-2.0.10-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
6 Do you want to delete it? [Y/n] n
7 error: krb5: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
8 :: File /var/cache/pacman/pkg/krb5-1.13.7-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
9 Do you want to delete it? [Y/n] n
10 error: libpsl: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
11 :: File /var/cache/pacman/pkg/libpsl-0.16.1-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
12 Do you want to delete it? [Y/n] n
13 error: libwmf: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
14 :: File /var/cache/pacman/pkg/libwmf-0.2.8.4-14-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
15 Do you want to delete it? [Y/n] n
16 error: shutter: signature from "Levente Polyak (anthraxx) <levente@leventepolyak.net>" is unknown trust
17 :: File /var/cache/pacman/pkg/shutter-0.93.1-3-any.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
18 Do you want to delete it? [Y/n] n
19error: failed to commit transaction (invalid or corrupted package)
20 Errors occurred, no packages were upgraded.
百度关键词signature from archlinux
百度贴吧的解决方法是
1 # pacman-key --init
2 # pacman-key --populate
失败
想通过卸载的方式结果
1 [local1@lqspc ~]$ sudo pacman -Rcn jasper
2checking dependencies...
3 :: avahi optionally requires gtk3: avahi-discover-standalone, bshell, bssh, bvnc
4:: avahi optionally requires gtk2: gtk2 bindings
5 :: avahi optionally requires pygtk: avahi-bookmarks, avahi-discover
6:: gegl02 optionally requires librsvg: svg plugin
7:: gegl02 optionally requires jasper: jasper plugin
8 :: imagemagick optionally requires ghostscript: for Ghostscript support
9 :: imagemagick optionally requires librsvg: for SVG support
10 :: libwmf optionally requires gdk-pixbuf2: for pixbuf loader
11 :: lxde-common optionally requires lxde-icon-theme: default icon theme
12:: pinentry optionally requires gtk2: gtk2 backend
13:: pinentry optionally requires gcr: gnome3 backend
14 :: xdg-utils optionally requires libgnome: for GNOME support in xdg-open
15 :: xdg-utils optionally requires pcmanfm: for LXDE support in xdg-open
1617 Packages (68) adwaita-icon-theme-3.20-2 bluefish-2.2.9-1 chromium-53.0.2785.116-1 emacs-25.1-1 evince-3.20.1-2 fcitx-4.2.9.1-218 fcitx-gtk2-4.2.9.1-2 fcitx-gtk3-4.2.9.1-2 fcitx-qt4-4.2.9.1-2file-roller-3.20.3-1 flashplugin-11.2.202.635-1 gcr-3.20.0-219 gdk-pixbuf2-2.34.0-2 gedit-3.20.2-1 ghostscript-9.19-3 gnome-desktop-1:3.20.2-1 gnome-perl-1.045-4 gnome-vfs-perl-1.082-420 gnomecanvas-perl-1.002-14 goocanvas1-1.0.0-3 gpicview-0.2.5-2 gspell-1.0.3-1 gtk-engines-2.21.0-321 gtk-update-icon-cache-3.20.9-1 gtk2-2.24.31-1 gtk2-perl-1.2498-2 gtk3-3.20.9-1 gtkimageview-1.6.4-4 gtksourceview3-3.20.4-122 gvfs-1.28.3-1 libbonoboui-2.24.5-3 libfm-gtk2-1.2.4-2 libglade-2.6.4-5 libgnome-2.32.1-6 libgnomecanvas-2.30.3-323 libgnomeui-2.24.5-2 libkeybinder2-0.3.1-1 libnotify-0.7.6-2 libpeas-1.18.0-2 librsvg-2:2.40.16-1 libspectre-0.2.8-124 libunique-1.1.6-6 libwnck-2.31.0-1 lxappearance-0.6.2-1 lxappearance-obconf-0.2.3-1 lxde-icon-theme-0.5.1-3 lxdm-0.5.3-325 lxinput-0.3.5-1 lxlauncher-0.2.5-1 lxmusic-0.4.7-1 lxpanel-0.8.2-1 lxrandr-0.3.1-1 lxsession-1:0.5.2-2 lxtask-0.1.7-126 lxterminal-0.2.0-3 network-manager-applet-1.4.0-1 nm-connection-editor-1.4.0-1 obconf-2.0.4-4 openbox-3.6.1-3 pcmanfm-1.2.4-227perl-gnome2-wnck-0.16-11perl-goo-canvas-0.06-7perl-gtk2-imageview-0.05-7perl-gtk2-unique-0.05-13 pygtk-2.24.0-628 shutter-0.93.1-2 vte-0.28.2-8 jasper-1.900.1-152930 Total Removed Size: 678.11 MiB
3132 :: 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
1 Total Installed Size: 1787.46 MiB
2 Net Upgrade Size: 37.77 MiB
3 4 :: Proceed with installation? [Y/n]
5 (246/246) checking keys in keyring [##################################################] 100%
6 (246/246) checking package integrity [##################################################] 100%
7 (246/246) loading package files [##################################################] 100%
8 (246/246) checking forfile conflicts [##################################################] 100%
9error: failed to commit transaction (conflicting files)
10 ttf-dejavu: /etc/fonts/conf.d/20-unhint-small-dejavu-sans-mono.conf exists in filesystem
11 ttf-dejavu: /etc/fonts/conf.d/20-unhint-small-dejavu-sans.conf exists in filesystem
12 ttf-dejavu: /etc/fonts/conf.d/20-unhint-small-dejavu-serif.conf exists in filesystem
13 ttf-dejavu: /etc/fonts/conf.d/57-dejavu-sans-mono.conf exists in filesystem
14 ttf-dejavu: /etc/fonts/conf.d/57-dejavu-sans.conf exists in filesystem
15 ttf-dejavu: /etc/fonts/conf.d/57-dejavu-serif.conf exists in filesystem
16 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
1 extra/xproto 7.0.29-17.0.31-10.00 MiB
2 extra/xterm 325-1327-10.00 MiB
3 core/xz 5.2.2-15.2.3-10.00 MiB
4 core/zlib 1.2.8-41:1.2.8-70.00 MiB
5 6 Total Installed Size: 1785.65 MiB
7 Net Upgrade Size: 37.76 MiB
8 9 :: Proceed with installation? [Y/n]
10 (244/244) checking keys in keyring [##################################################] 100%
11 (244/244) checking package integrity [##################################################] 100%
12 (244/244) loading package files [##################################################] 100%
13 (244/244) checking forfile conflicts [##################################################] 100%
14 (245/245) checking available disk space [##################################################] 100%
15:: Processing package changes...
16 (1/1) removing fuse [##################################################] 100%
17 ( 1/244) upgrading iana-etc [##################################################] 100%
18 ( 2/244) upgrading attr [##################################################] 100%
19 ( 3/244) upgrading acl [##################################################] 100%
20 ( 4/244) upgrading ncurses [##################################################] 100%
21 ( 5/244) upgrading readline [##################################################] 100%
22 ( 6/244) upgrading zlib [##################################################] 100%
23 ( 7/244) upgrading bash [##################################################] 100%
原文：http://www.cnblogs.com/liq07lzucn/p/6275849.html
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