[NTG-context] LuaTeX error after update to ubuntu 12.04

[S Barmeier]

After updating to ubuntu 12.04, my shouts of joy were smothered by the
following

!LuaTeX error: cannot find OpenType font file for reading ()
 ==> Fatal error occurred, no output PDF file produced!

mtx-context     | fatal error: return code: 70

I ran mtxrun --script fonts --reload, updated to the latest context
version, ran luatools --generate and context --make and still am
presented with the above error message after 10-15 minutes of paralysing
processing.

The compiling seems to run as always, until it reaches the last page, at
which point the computer freezes and takes about 10 minutes to present
me with the error. The following is another snapshot of the output which
I noticed for the first time:

system          > logs > lua: compiling
/home/user/texmf-cache/luatex-cache/context/2448223e6631addb83df348d74153606/fonts/otf/andika-r.tma
into
/home/user/texmf-cache/luatex-cache/context/2448223e6631addb83df348d74153606/fonts/otf/andika-r.tmc
										fonts           > otf loading > preprocessing and caching took
73.009 seconds

Any ideas where to start?

Many thanks,
Severin