By the way, was there any change to the font searching lately?
I used to create symlink /ctx-version/tex/texmf-local/fonts and after mtxrun --script fonts --reload these fonts were recognized.
With beta it doesn't seem to work, I've double checked the older versions where same symlink behaves as usual.

Jano




On Sat, 26 May 2018 at 15:46, Jano Kula <jano.kula@gmail.com> wrote:
Hello,

installing latest stable standalone version on Ubuntu 16.04 x64:
./first-setup.sh --context=current --engine=luatex

fails with:
This is LuaTeX, Version 1.08.0 (TeX Live 2018)  (INITEX)
 system commands enabled.
error in callback: ...018/tex/texmf-context/tex/context/base/mkiv/luat-cod.lua:194: attempt to call a nil value (upvalue 'isfile')
.
<insert>  
 
<*> ...mf-context/tex/context/base/mkiv/cont-en.mkiv 
                                                  dump

Beta on the same machine installs correctly.

Jano