all packages are deleted while closing terminal and open it again

hey ,
I installed all packages and installed vrecord and worked perfectly . but when ever I restart my PC I could not run Vrecord any more and it shows a massage that CMD not found. when also triewd to type "brew" to install vrcord again. it gave that command not found.
so, I did all setup again and I installed evry thins. and this time I just close the terminal and open it again and all packages are deleted.
when I checked the packages installed I found all there excpet Homebrew . it seems not installed correctly

my system is ubunto latest one . ubunto run is main operatin system .