again thank you very much. Your links were for the Machiatobin which is Armada 8040 - the Espressobin is using 3720. However it gave me enough food for thought to sucessfully compile Ubuntu 14.04. LTS with it.
Just a short write up how it worked out for others and my later me:
1. Compile Kernel Image and DTB - latest supported Kernel is 4.4.8
https://web.archive.org/web/20210307141251/http://wiki.espressobin.net/tiki-index.php?page=Build+From+Source+-+Kernel
2. Fix Errors during compilation
/usr/bin/ld: scripts/dtc/dtc-parser.tab.o:(.bss+0x10): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x0): first defined here
sed -i 's/^YYLTYPE yylloc;$/extern YYLTYPE yylloc;/' scripts/dtc/dtc-lexer.l sed -i 's/^YYLTYPE yylloc;$/extern YYLTYPE yylloc;/' scripts/dtc/dtc-lexer.lex.c
https://web.archive.org/save/https://forum.0cd.xyz/t/building-u-boot-for-the-espressobin/511
3. Prepare Ubuntu 14.04.5 LTS to boot from SDCard
https://web.archive.org/save/http://wiki.espressobin.net/tiki-index.php?page=Boot+from+removable+storage+-+Ubuntu
