My Rstudio was working fine until last week when the same script could not be executed using DADA2 command. I tried different solutions to solve the problem but none of them worked and then suddenly rstudio froze and every time I re-started ubuntu, and rstudio, a blank screen is displayed with an unresponsive bar menu. I am wondering if I should remove R and rstudio and reinstall them. The program is installed on Ubuntu 18.04 operated machine.