may have worked but because of all the other LC variables which are now setup and which are not overriden by setting LANG=C, the work around for the bug in twm being unable to open the fixed font for UTF-8 and other encodings is to specify
LC_ALL=C twm &
You may even find that
LC_ALL=en twm &
where "en" is "English" also works (along with other two letter language variants) but anything more specific cauting UTF-8 enocding to be invoked such as en_GB or en_US will give the same error as "unable to open fontset fixed".
At one time in Bourne shell and derivatives
LANG=C twm &
may have worked but because of all the other LC variables which are now setup and which are not overriden by setting LANG=C, the work around for the bug in twm being unable to open the fixed font for UTF-8 and other encodings is to specify
LC_ALL=C twm &
You may even find that
LC_ALL=en twm &
where "en" is "English" also works (along with other two letter language variants) but anything more specific cauting UTF-8 enocding to be invoked such as en_GB or en_US will give the same error as "unable to open fontset fixed".