Added steps to run interface in Ubuntu 18.04 .

BUILD_LINUX.md

@@ -86,19 +86,73 @@ In a server, it does not make sense to compile interface
 
 ### Running the software
 
+#### Domain server
+
 Running domain server:
 ```bash
 ./domain-server/domain-server
 ```
 
+#### Assignment clients
+
 Running assignment client:
 ```bash
 ./assignment-client/assignment-client -n 6
 ```
 
+#### Interface
+
 Running interface:
 ```bash
 ./interface/interface
 ```
 
 Go to localhost in the running interface.
+
+##### Ubuntu 18.04 only
+
+In Ubuntu 18.04 there is a problem related with NVidia driver library version.
+
+It can be workarounded following these steps:
+
+Uninstall incompatible nvtt libraries:
+```bash
+sudo apt-get remove libnvtt2 libnvtt-dev
+```
+
+Install libssl1.0-dev:
+```bash
+sudo apt-get -y install libssl1.0-dev
+```
+
+Clone castano nvidia-texture-tools:
+```
+git clone https://github.com/castano/nvidia-texture-tools
+cd nvidia-texture-tools/
+```
+
+Make these changes in repo:
+* In file **VERSION** set `2.2.1`
+* In file **configure**:
+  * set `build="release"`
+  * set `-DNVTT_SHARED=1`
+
+Configure, build and install:
+```
+./configure
+make
+sudo make install
+```
+
+Link compiled files:
+```
+sudo ln -s /usr/local/lib/libnvcore.so /usr/lib/libnvcore.so
+sudo ln -s /usr/local/lib/libnvimage.so /usr/lib/libnvimage.so
+sudo ln -s /usr/local/lib/libnvmath.so /usr/lib/libnvmath.so
+sudo ln -s /usr/local/lib/libnvtt.so /usr/lib/libnvtt.so
+```
+
+After running this steps you can run interface:
+```
+interface/interface
+```