Why do I get `bitcoind: command not found` in Ubuntu? I have built the bitcoin source on my Ubuntu desktop, and have installed the proper libraries via apt-get and building some. 

When I do:

cd src
bitcoind -daemon


I get the error:

bitcoind: command not found


and when I do ./bitcoin I get:

bash: ./bitcoin: No such file or directory


What am I doing wrong?
Go to the directory with the bitcoind binary.

Make sure it's executable:
chmod +x bitcoind

Now run it:
./bitcoind -daemon