How do I install a Fortran compiler?

[penguian]

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I am new to Codespaces. I cannot find the documentation that tells me how to install a Fortran compiler. Where is it?

./configure
[...]
checking for g77... no
checking for xlf... no
checking for f77... no
checking for frt... no
checking for pgf77... no
checking for cf77... no
checking for fort77... no
checking for fl32... no
checking for af77... no
checking for xlf90... no
checking for f90... no
checking for pgf90... no
checking for pghpf... no
checking for epcf90... no
checking for gfortran... no
checking for g95... no
checking for xlf95... no
checking for f95... no
checking for fort... no
checking for ifort... no
checking for ifc... no
checking for efc... no
checking for pgfortran... no
checking for pgf95... no
checking for lf95... no
checking for ftn... no
checking for nagfor... no
checking whether we are using the GNU Fortran 77 compiler... no
checking whether  accepts -g... no
checking how to get verbose linking output from ... configure: WARNING: compilation failed

checking for Fortran 77 libraries of ... 
checking for gcc... gcc
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking dependency style of gcc... gcc3
checking for dummy main to link with Fortran 77 libraries... none
checking for Fortran 77 name-mangling scheme... configure: error: in `/workspaces/glucat':
configure: error: cannot compile a simple Fortran program
See `config.log' for more details

[penguian]

sudo apt-get install gfortran does not work.

@penguian ➜ /workspaces/glucat (master) $ sudo apt-get install gfortran
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package gfortran is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'gfortran' has no installation candidate

[Wangrry97]

you need to sudo apt-get update first

[penguian]

Also

@penguian ➜ /workspaces/glucat (master) $ sudo apt search fortran
Sorting... Done
Full Text Search... Done
gdb/now 9.2-0ubuntu1~20.04.1 amd64 [installed,local]
  GNU Debugger

gdbserver/now 9.2-0ubuntu1~20.04.1 amd64 [installed,local]
  GNU Debugger (remote server)

libgomp1/now 10.5.0-1ubuntu1~20.04 amd64 [installed,local]
  GCC OpenMP (GOMP) support library

libquadmath0/now 10.5.0-1ubuntu1~20.04 amd64 [installed,local]
  GCC Quad-Precision Math Library

libtool/now 2.4.6-14 all [installed,local]
  Generic library support script

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