In this case, it always fails by "sudo add-apt-repository -y “ppa:marutter/c2d4u3.5"” :
bash: sudo add-apt-repository -y ppa:marutter/c2d4u3.5
sudo add-apt-repository -y ppa:marutter/c2d4u3.5: Datei oder Verzeichnis nicht gefunden
(In English it says that the file or directory was not found)
I tried using this with Ubuntu 21.04 but it returned these errors
ERROR: dependencies ‘rstan’, ‘threejs’ are not available for package ‘shinystan’
* removing ‘/usr/local/lib/R/site-library/shinystan’
The downloaded source packages are in
‘/tmp/RtmpC2hgX7/downloaded_packages’
Warning messages:
1: In install.packages("rstan", repos = "https://cloud.r-project.org/", :
installation of package ‘igraph’ had non-zero exit status
2: In install.packages("rstan", repos = "https://cloud.r-project.org/", :
installation of package ‘RcppEigen’ had non-zero exit status
3: In install.packages("rstan", repos = "https://cloud.r-project.org/", :
installation of package ‘StanHeaders’ had non-zero exit status
4: In install.packages("rstan", repos = "https://cloud.r-project.org/", :
installation of package ‘threejs’ had non-zero exit status
5: In install.packages("rstan", repos = "https://cloud.r-project.org/", :
installation of package ‘rstan’ had non-zero exit status
6: In install.packages("rstan", repos = "https://cloud.r-project.org/", :
installation of package ‘shinystan’ had non-zero exit status