adobe flash instalation

[angelgabrielle8]

keep trying to insrall adobe flash o gnome ubuntu 12.4....just updated. First of all my terminal seems to have disappeared from the top with the links from before.. But found it on the keyboard. I keep getting this.What can I do please?
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 6,946 B of archives.
After this operation, 139 kB of additional disk space will be used.
Err http://gb.archive.ubuntu.com/ubuntu/ precise-updates/multiverse flashplugin-installer i386 11.2.202.327ubuntu0.12.04.1
404 Not Found [IP: 91.189.92.200 80]
Err http://security.ubuntu.com/ubuntu/ precise-security/multiverse flashplugin-installer i386 11.2.202.327ubuntu0.12.04.1
404 Not Found [IP: 91.189.92.184 80]
Failed to fetch http://security.ubuntu.com/ubuntu/po....04.1_i386.deb 404 Not Found [IP: 91.189.92.184 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
nopassword@eeepc:~$ password
password: command not found
nopassword@eeepc:~$ password
password: command not found
nopassword@eeepc:~$
nopassword@eeepc:~$ password
password: command not found
nopassword@eeepc:~$ password
password: command not found
nopassword@eeepc:~$

[deadflowr]

password isn't a command.
a command is something you make the computer do, like upgrade or install packages.
first run a command like

sudo apt-get update

then, since you would be asking the command to run with root rights(sudo), it'll ask for a password.
Note that password field in the terminal are blank, type it as you remember it.