Install "Daedalus Wallet??"
Solution 1:
I assume that you have downloaded a file from https://daedaluswallet.io/en/download/.
From a terminal, navigate to the folder that contains the downloaded file, e.g.:
$ cd ~/Downloads
Your download is an executable file, and so in principle you could install the program by entering the name of the file as a command. However, for security reasons, after downloading it doesn't have the "executable bit" on. So make it executable first:
$ chmod +x daedalus-4.2.1-mainnet-18759.bin
(Filename is what my downloaded file was called).
Then execute it:
$ ./daedalus-4.2.1-mainnet-18759.bin
That should do it. Mind that you can use auto-complete on long filenames such as these: type enough letters and press Tab.
$ ./daed
Tab
$ ./daedalus-4.2.1-mainnet-18759.bin