apt - I've failed to install the R package, broken packages

gui@pcgui:~$ 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-base-core (>= 3.5.1-1bionic) but it is not going to be installed
          Depends: r-recommended (= 3.5.1-1bionic) but it is not going to be installed
          Recommends: r-base-html but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I dont what to do.

and, I've found the solution which failed to help me,
if i input

gui@pcgui:~/Downloads$ sudo apt install r-base-core
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-core : Depends: libblas3 but it is not installable or
                        libblas.so.3 but it is not installable
               Depends: libcurl4 (>= 7.28.0) but it is not installable
               Depends: liblapack3 but it is not installable or
                        liblapack.so.3 but it is not installable
               Depends: libtcl8.6 (>= 8.6.0) but it is not installable
               Depends: libtk8.6 (>= 8.6.0) but it is not installable
               Recommends: r-recommended but it is not going to be installed
               Recommends: r-base-dev but it is not going to be installed
               Recommends: r-doc-html but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

and, for last, i've encountered a situation which asked me [Y/n] and I input Y and it aborted.