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Where is the message where wget downloaded/saved `install_flash_player_10_linux.tar.gz' ?
Maybe you have an internet connection problem to fpdownload.macromedia.com ?
I just ran #get-flash-plugin script:
root@blending:~# get-flash-plugin
--2011-06-23 08:37:19-- http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_10_linux.tar.gz
Resolving fpdownload.macromedia.com (fpdownload.macromedia.com)... 184.84.66.70
Connecting to fpdownload.macromedia.com (fpdownload.macromedia.com)|184.84.66.70|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5456694 (5.2M) [application/x-gzip]
Saving to: `install_flash_player_10_linux.tar.gz'
100%[======================================>] 5,456,694 2.58M/s in 2.0s
2011-06-23 08:37:21 (2.58 MB/s) - `install_flash_player_10_linux.tar.gz' saved [5456694/5456694]
ls: /usr/lib/libxul.so: No such file or directory
Packing : flash-plugin-10.3.181.26
================================================================================
Creating the list of files... [ OK ]
Creating md5sum of files... [ OK ]
Compressing the fs... [ OK ]
Updating receipt sizes... [ OK ]
Creating full cpio archive... [ OK ]
Restoring original package tree... [ OK ]
================================================================================
Package flash-plugin-10.3.181.26 compressed successfully.
Size : 3.8M flash-plugin-10.3.181.26.tazpkg
Installation of : flash-plugin
================================================================================
Copying flash-plugin... [ OK ]
Extracting flash-plugin... [ OK ]
Extracting the pseudo fs... (lzma) [ OK ]
Installing flash-plugin... [ OK ]
Removing all tmp files... [ OK ]
Processing post install commands...ln: /usr/lib/firefox*/plugins: No such file or directory
[ OK ]
================================================================================
flash-plugin (10.3.181.26) is installed.