Cfrgtkky

After upgrading from Ubuntu 16 to 18.4, I am not able to install the rJava package in R.

I read other posts like this, but I didn't solve my issue.
if I run install.packages("rJava") on R, Results is this:

Error: package or namespace load failed for ‘rJava’:

.onLoad failed in loadNamespace() for 'rJava', details:

  call: dyn.load(file, DLLpath = DLLpath, ...)

  error: unable to load shared object '/home/salvatore/R/x86_64-pc-linux-gnu-library/3.5/rJava/libs/rJava.so':

  libjvm.so: cannot open shared object file: No such file or directory

Error: loading failed

Execution halted

ERROR: loading failed

* removing ‘/home/salvatore/R/x86_64-pc-linux-gnu-library/3.5/rJava’

when I run sudo R CMD javareconf:

Java interpreter : /usr/lib/jvm/java-8-oracle/jre/bin/java

Java version     : 1.8.0_181

Java home path   : /usr/lib/jvm/java-8-oracle

Java compiler    : /usr/lib/jvm/java-8-oracle/bin/javac

Java headers gen.: /usr/lib/jvm/java-8-oracle/bin/javah

Java archive tool: /usr/lib/jvm/java-8-oracle/bin/jar



trying to compile and link a JNI program 

detected JNI cpp flags    : -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/linux

detected JNI linker flags : -L$(JAVA_HOME)/jre/lib/amd64/server -ljvm

gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG -I/usr/lib/jvm/java-8-oracle/include -I/usr/lib/jvm/java-8-oracle/include/linux     -fpic  -g -O2 -fdebug-prefix-map=/build/r-base-oNcpyf/r-base-3.5.1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g  -c conftest.c -o conftest.o

gcc -std=gnu99 -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o conftest.so conftest.o -L/usr/lib/jvm/java-8-oracle/jre/lib/amd64/server -ljvm -L/usr/lib/R/lib -lR





JAVA_HOME        : /usr/lib/jvm/java-8-oracle

Java library path: $(JAVA_HOME)/jre/lib/amd64/server

JNI cpp flags    : -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/linux

JNI linker flags : -L$(JAVA_HOME)/jre/lib/amd64/server -ljvm

Updating Java configuration in /usr/lib/R

Done.

Any help would be welcome.

In my case, I also had to use: sudo R CMD javareconf, to make it work.

On my clean installation of Ubuntu 18.04 LTS I did the following

sudo apt-get install r-base-dev default-jdk

(so I have R 3.4 from official repository).

Then in R or in RStudio 1.1.456 session:

install.packages('rJava')

and it ended with

* DONE (rJava)

Note: I'm using default OpenJDK 11 from Bionic repository -

$ update-java-alternatives -l

java-1.11.0-openjdk-amd64      1101      /usr/lib/jvm/java-1.11.0-openjdk-amd64