Thank you for the detailed instructions. I did that and got the following result.
....
Ign
http://www.hu.freepascal.org lazarus-stable/universe Translation-en_US
Ign
http://www.hu.freepascal.org lazarus-stable/universe Translation-en
Ign
http://www.openprinting.org lsb3.2/contrib Translation-en_US
Get:141
http://www.openprinting.org lsb3.2/contrib Translation-en
Ign
http://archive.getdeb.net trusty-getdeb/games Translation-en_US
Ign
http://archive.getdeb.net trusty-getdeb/games Translation-en
Fetched 16.7 MB in 22s (730 kB/s)
Reading package lists... Done
court@Samsung305E:~$ sudo apt install chromium browser
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package chromium 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
However the following packages replace it:
chromium-bsu
E: Package 'chromium' has no installation candidate
E: Unable to locate package browser
court@Samsung305E:~$