R　インストール方法

    sakata@sakata-FMVS90XWD2:/etc/apt$ sudo apt-get install r-base
    sakata@sakata-FMVS90XWD2:/etc/apt$ sudo apt-get install r-base
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    Some packages could not be installed. This may mean that you have
    requested an impossible situation or if you are using the unstable
    distribution that some required packages have not yet been created
    or been moved out of Incoming.
    The following information may help to resolve the situation:

    The following packages have unmet dependencies:
     r-base : Depends: r-recommended (= 3.6.1-3bionic) but it is not going to be             installed
    E: Unable to correct problems, you have held broken packages.
    sakata@sakata-FMVS90XWD2:/etc/apt$ sudo apt-get install r-base
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    Some packages could not be installed. This may mean that you have
    requested an impossible situation or if you are using the unstable
    distribution that some required packages have not yet been created
    or been moved out of Incoming.
    The following information may help to resolve the situation:

    The following packages have unmet dependencies :
     r-base : Depends: r-recommended (= 3.6.1-3bionic) but it is not going to be     installed
    E: Unable to correct problems, you have held broken packages.
    sakata@sakata-FMVS90XWD2:/etc/apt$ sudo apt-get install r-recommended
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    Some packages could not be installed. This may mean that you have
    requested an impossible situation or if you are using the unstable
    distribution that some required packages have not yet been created
    or been moved out of Incoming.
    The following information may help to resolve the situation:

    The following packages have unmet dependencies:
      r-recommended : Depends: r-cran-kernsmooth (>= 2.2.14) but it is not going to be installed
    E: Unable to correct problems, you have held broken packages.
    sakata@sakata-FMVS90XWD2:/etc/apt$ sudo apt-get install r-cran-kernsmooth
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    Some packages could not be installed. This may mean that you have
    requested an impossible situation or if you are using the unstable
    distribution that some required packages have not yet been created
    or been moved out of Incoming.
    The following information may help to resolve the situation:

    The following packages have unmet dependencies:
     r-cran-kernsmooth : Depends: r-api-3
    E: Unable to correct problems, you have held broken packages.
    sakata@sakata-FMVS90XWD2:/etc/apt$ sudo apt-get install r-api-3
    Reading package lists... Done 
    Building dependency tree       
    Reading state information... Done
    Package r-api-3 is a virtual package provided by:
      r-base-core 3.4.4-1trusty0 [Not candidate version]
      r-base-core 3.4.3-1trusty0 [Not candidate version]
      r-base-core 3.4.2-2trusty [Not candidate version]
      r-base-core 3.4.2-1trusty1 [Not candidate version]
      E: Package 'r-api-3' has no installation candidate