We cannot install ipfs in one of the directories /usr/local/bin /usr/bin
I have tried to give everything permissions and restart computer，but the problem still here
Can anyone help me to solve this problem?
could you move manually /ipfs on your /usr/bin ?
yea, i move ipfs to path /user/bin, it’s work and i install it successful, Thx a lot!
Not sure which system you’re on, and which installation method you’re using, but I’m on macOS, and I’m using Homebrew, and sometimes permissions get messed up: brew is without sudo, but other installations (not via Homebrew) into /usr/local can chown the directory to the system default root, e.g. ClamXAV (at least earlier versions). In these cases I’m running sudo chown $(id -un):admin /usr/local, and installations into /usr/local (incl. /usr/local/bin) work again. Sometimes you read that you should chown recursively, i.e. sudo chown -R $(id -un):admin /usr/local, but I found out that this is not necessary. You should definitely not chown recursively, if you’ve installed security software in there, like the afore-mentioned ClamXAV. You wouldn’t want userspace processes having read/write access to your anti-virus definitions. 
copy to /usr/bin did not work for me, however /usr/local/bin was not available , tried creating /usr/local/bin. Then used
sudo install.sh
it worked.
Not sure if there would be a problem… will find out