We are getting below error while installing R 4.2.1 on Ubuntu 18.04,

- apt-get -s -o Debug::pkgProblemResolver=yes install -y --allow-downgrades -o APT::Immediate-Configure=0 'r-base=4.2.1*' 'r-base-dev=4.2.1*' 'r-base-core=4.2.1*' 'r-recommended=4.2.1*'

Reading package lists...

Building dependency tree...

Reading state information...

Starting pkgProblemResolver with broken count: 1

Starting 2 pkgProblemResolver with broken count: 1

Investigating (0) r-recommended:amd64 < none -> 4.2.1-3.1804.0 @un puN Ib >

Broken r-recommended:amd64 Depends on r-cran-mass:amd64 < none | 7.3-59-1.1804.0 @un uH >

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Reinst Failed because of protected r-base-core:amd64

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-mass:amd64 1 as a solution to r-recommended:amd64 10012

Broken r-recommended:amd64 Depends on r-cran-class:amd64 < none | 7.3-21-1.1804.0 @un uH >

Considering r-cran-class:amd64 1 as a solution to r-recommended:amd64 10012

Reinst Failed because of protected r-base-core:amd64

Considering r-cran-class:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-class:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-class:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-class:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-class:amd64 1 as a solution to r-recommended:amd64 10012

Considering r-cran-class:amd64 1 as a solution to r-recommended:amd64 10012

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-mass but it is not going to be installed

Depends: r-cran-class but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

Is there any way to install specific version of R on ubuntu.