所以根據自述文件和 foobnix wabpage 的說明，我必須在終端機中輸入這些命令來安裝 foobnix
sudo add-apt-repository ppa:foobnix-team/foobnix-player
sudo apt-get update
sudo apt-get install foobnix
我正是這樣做的，這就是發生的事情：
sudo add-apt-repository ppa:foobnix-team/foobnix-player
More info: https://launchpad.net/~foobnix-team/+archive/ubuntu/foobnix-player
Press [ENTER] to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmpgq34w_l7/secring.gpg' created
gpg: keyring `/tmp/tmpgq34w_l7/pubring.gpg' created
gpg: requesting key 635CDE15 from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpgq34w_l7/trustdb.gpg: trustdb created
gpg: key 635CDE15: public key "Launchpad PPA for Foobnix Team" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
OK
更新結果，太久沒看版本了
a lot of stuff linked to foobnix hasn't been downloaded from launchpad because of 404 error
E: Some index files failed to download. They have been ignored, or old ones used instead.
最後
sudo apt-get install foobnix
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package foobnix is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'foobnix' has no installation candidate
怎麼辦？我不知道。
是的，我嘗試使用搜尋引擎找到答案。