Ubuntu中文论坛

i want to know why
i do followed the web to config chinese input,but after i do the 2nd step "$sudo im-switch -s scim"
computer tell me "sudo: im-switch: command not found"
could anybody tell me why? thanks :

你确定之前的都做了？？
特别是

sudo apt-get install im-switch libapt-pkg-perl

Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
scim-modules-table scim-pinyin scim-qtimm scim-tables-zh
Install these packages without verification [y/N]? y
Get:1 http://security.ubuntu.com dapper-security/main libqt3-mt 3:3.3.6-1ubuntu6.1 [3153kB]
Get:2 http://au.archive.ubuntu.com dapper/main scim-modules-table 0.5.6-1build1 [326kB]
Get:3 http://au.archive.ubuntu.com dapper/main scim-pinyin 0.5.91-0ubuntu3 [2251kB]
Get:4 http://au.archive.ubuntu.com dapper/main scim-qtimm 0.9.4-0ubuntu4 [52.3kB]
Get:5 http://au.archive.ubuntu.com dapper/main scim-tables-zh 0.5.6-1build1 [6358kB]
Fetched 12.1MB in 11m22s (17.8kB/s)
Selecting previously deselected package libqt3-mt.
(Reading database ... 69523 files and directories currently installed.)
Unpacking libqt3-mt (from .../libqt3-mt_3%3a3.3.6-1ubuntu6.1_i386.deb) ...
Selecting previously deselected package scim-modules-table.
Unpacking scim-modules-table (from .../scim-modules-table_0.5.6-1build1_i386.deb) ...
Selecting previously deselected package scim-pinyin.
Unpacking scim-pinyin (from .../scim-pinyin_0.5.91-0ubuntu3_i386.deb) ...
Selecting previously deselected package scim-qtimm.
Unpacking scim-qtimm (from .../scim-qtimm_0.9.4-0ubuntu4_i386.deb) ...
Selecting previously deselected package scim-tables-zh.
Unpacking scim-tables-zh (from .../scim-tables-zh_0.5.6-1build1_all.deb) ...
Setting up libqt3-mt (3.3.6-1ubuntu6.1) ...

Setting up scim-modules-table (0.5.6-1build1) ...
Setting up scim-pinyin (0.5.91-0ubuntu3) ...

Setting up scim-qtimm (0.9.4-0ubuntu4) ...
Setting up scim-tables-zh (0.5.6-1build1) ...

is something wrong?

$ sudo apt-get install im-switch libapt-pkg-perl
need a password but i can't input anything

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问题解决，谢谢