sudo apt-get clean, update, upgrade completed without error. Thank you for
your assistance.
BTW, I checked other error messages, and found that the firefox package
file
/usr/share/doc/firefox-locale-en/copyright was correct. I could discern no
reason for that small error.
On Tue, May 22, 2018 at
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that there was an error on your system when
trying to install a particular package. Please execute the following
command, as it will clear your package cache, in a terminal:
sudo apt-get clean
Then try
