FYI: You can't run Bitcoin-qt via terminal, but you can run Bitcoind or Bitcoin-cli.
Better answers can be expected(from others and me) if you can post more details like what problem you are occuring, when it occur etc...
Edit: Recommended configuration(Bitcoin.conf):
Code:
server=1
rpcuser=a_username_which_isn't_easily_guessed.
rpcpassword=a_long_random_password
rpctimeout=60
rpcport=8332
paytxfee=0.0001
• Windows: Go to %AppData%\Bitcoin and create a new notepad file and name it "bitcoin.conf". After you do, open it and add the above code with preferred username and password and save it.
• Linux: Type "nano ~/.Bitcoin/bitcoin.conf" in terminal and add above code with preferred username and password and save it.
• Mac: Type “nano "~/Library/Application Support/Bitcoin/"” in terminal aand add above code with preferred username and password and save it.
Now run "bitcoind -daemon". Hopefully, blockchain will be downloaded now.