Shiny server disconnecting apps - linux

Question

We had shiny server running on an i686 machine under Ubuntu 16.04. After a recent upgrade server does not run the apps we were using to read and plot data from a MySQL database.
Now when we try to connect to our server the shiny app appears but in 1-2 seconds the screen goes to grey and a disconnected from server message appears
As there are no precompiled binaries for our system we have followed instructions to build from source at Rstudio github site. It apparently runs fine.
Shiny process is up and running
ps -ef | grep shiny
root 13596 1 0 10:19 ? 00:00:01 /usr/local/shiny-server/ext/node/bin/shiny-server /usr/local/shiny-server/lib/main.js --pidfile=/var/run/shiny-server.pid
status shiny-server
shiny-server start/running, process 13596
But at /var/log/shiny-server.log this error message appears
[2016-12-09 09:39:18.692][ERROR] shiny-server - Error getting worker: TypeError driver.validateOptions is not a function
Any idea of what happens with our server? Thanks in advance
Machine info:
uname -a Linux rack4tb 4.4.0-47-generic #68-Ubuntu SMP Wed Oct 26
19:39:59 UTC 2016 i686 i686 i686 GNU/Linux
EDIT
Add output from history > serverHistory.txt
meteo#rack4tb:~$ tail -n 50 serverHistory.txt
1952 $PYTHON --version
1953 cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DPYTHON="$PYTHON" ../
1954 shiny-server-1.4.2.0
1955 make
1956 mkdir ../build
1957 (cd .. && ./bin/npm --python="$PYTHON" install)
1958 (cd .. && ./bin/node ./ext/node/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js --python="$PYTHON" rebuild)
1959 sudo make install
1960 sudo ln -s /usr/local/shiny-server/bin/shiny-server /usr/bin/shiny-server
1961 ls -l /usr/local/shiny-server/bin/shiny-server
1962 ls -l /usr/bin/shiny-server
1963 rm /usr/bin/shiny-server
1964 sudo rm /usr/bin/shiny-server
1965 sudo ln -s /usr/local/shiny-server/bin/shiny-server /usr/bin/shiny-server
1966 sudo useradd -r -m shiny
1967 sudo mkdir -p /var/log/shiny-server
1968 sudo mkdir -p /srv/shiny-server
1969 sudo mkdir -p /var/lib/shiny-server
1970 sudo chown shiny /var/log/shiny-server
1971 sudo mkdir -p /etc/shiny-server
1972 cat /var/log/shiny-server
1973 cd /var/log/shiny-server
1974 ls -lrt
1975 cd ..
1976 ls
1977 ls -lrt
1978 cat shiny-server.log
1979 /etc/mysql$ shiny-server --version
1980 /etc/mysql shiny-server --version
1981 shiny-server --version
1982 uname -m
1983 uname -a
1984 ps -ef | grep shiny
1985 sudo status shiny-server
1986 status shiny-server
1987 exit
1988 cd /usr/local
1989 ls
1990 ls shiny-server/
1991 ls shiny-server/bin
1992 ls shiny-server/R
1993 cat shiny-server/VERSION
1994 cd
1995 ls
1996 ls Descargas/
1997 ls
1998 ls shiny-server*deb
1999 rm shiny-server*deb
2000 exit
2001 history > serverHistory.txt

Answer 1

What worked for me was to launch sudo R and install all packages the app needs:
sudo su - -c "R -e \"install.packages('package_name', repos = 'http://cran.rstudio.com/',dependencies =TRUE)\""