Thanks for your help. It was just that I needed to apt-get install as root, not sudo apt-get.
The following command # apt-get install flashplugin-nonfree worked just fine. $ sudo apt-get install flashplugin-nonfree failed because the invoked script probably did not have the write permission for a certain directory. This is a little bit confusing for a newbie like me. But, anyway, I can now see the videos on youtube. I appreciate the help by everyone. Han Soo 2012/4/30, Johan Grönqvist <johan.gronqv...@gmail.com>: > 2012-04-30 07:46, Han Soo Chang skrev: >>> If you try fetching it with wget: >>> "wget >>> http://people.debian.org/~bartm/flashplugin-nonfree/fp10.sha512.amd64.pgp.asc" >>> does it produce an error message? >> >> This is the message I get. >> I am inside a corporate LAN with a proxy server whose address is >> ns14:8080. >> >> >> Cannot write to `fp10.sha512.amd64.pgp.asc' (Permission denied). >> > > As Curt wrote, it seems that you can not write the output file. > > To verify that it is not network related: > > "wget > http://people.debian.org/~bartm/flashplugin-nonfree/fp10.sha512.amd64.pgp.asc" > > tries tio fetch and write to file, which does not work, as you tried > before. > > "wget > http://people.debian.org/~bartm/flashplugin-nonfree/fp10.sha512.amd64.pgp.asc > > -O -" will try to fetch the file and print it to standard output, so > that you see it on screen. I expect that to work without problems. > > Is this a special setup with special write permissions? > > My interpretation is that the installation scripts fails to write a file > that it wants to save to disc for later use. > > Regards > > Johan > > > -- > To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact > listmas...@lists.debian.org > Archive: http://lists.debian.org/jnm7ou$bmr$1...@dough.gmane.org > > -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/CADZ+JBo7e5=mbuznsyz96byg7cqiqx6hsmrucape5qx25ub...@mail.gmail.com