I'm getting an error
No rule to make target 'tinker-rk3288_defconfig'
while typing the command ./compile.sh
[ o.k. ] Using config file [ config-default.conf ]
[ o.k. ] This script will try to update
Already up-to-date.
Already on 'master'
Your branch is up-to-date with 'origin/master'.
[ o.k. ] Preparing [ host ]
[ o.k. ] Build host OS release [ xenial ]
[ o.k. ] Syncing clock [ host ]
[ .... ] Downloading [ gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux ]
######################################################################## 100.0%
######################################################################## 100.0%
[ .... ] Verifying
gpg: error reading key: public key not found
gpg: requesting key 8F427EAF from hkp server keyserver.ubuntu.com
?: keyserver.ubuntu.com: Connection refused
gpgkeys: HTTP fetch error 7: couldn't connect: Connection refused
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
gpg: keyserver communications error: keyserver unreachable
gpg: keyserver communications error: public key not found
gpg: keyserver receive failed: public key not found
gpg: assuming signed data in `gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux.tar.xz'
gpg: Signature made Wed 16 Apr 2014 08:29:14 PM CEST using RSA key ID 8F427EAF
gpg: Can't check signature: public key not found
[ warn ] Verification failed
[ o.k. ] Downloading sources
[ o.k. ] Checking git sources [ u-boot master ]
fatal: unable to connect to git.denx.de:
git.denx.de[0: 85.214.87.163]: errno=Connection refused
[ .... ] Fetching updates
fatal: unable to connect to git.denx.de:
git.denx.de[0: 85.214.87.163]: errno=Connection refused
[ .... ] Checking out
error: pathspec 'FETCH_HEAD' did not match any file(s) known to git.
[ o.k. ] Checking git sources [ linux-mainline linux-4.12.y ]
fatal: unable to connect to git.kernel.org:
git.kernel.org[0: 147.75.205.195]: errno=Connection refused
git.kernel.org[1: 2604:1380:2000:f000::7]: errno=Network is unreachable
[ .... ] Fetching updates
fatal: unable to connect to git.kernel.org:
git.kernel.org[0: 147.75.205.195]: errno=Connection refused
git.kernel.org[1: 2604:1380:2000:f000::7]: errno=Network is unreachable
[ .... ] Checking out
error: pathspec 'FETCH_HEAD' did not match any file(s) known to git.
[ o.k. ] Checking git sources [ sunxi-tools master ]
[ .... ] Up to date
[ o.k. ] Checking git sources [ armbian-config dev ]
[ .... ] Up to date
[ o.k. ] Cleaning output/debs for [ tinkerboard next ]
[ o.k. ] Cleaning [ u-boot/master ]
grep: /home/vce/build/cache/sources/u-boot/master/Makefile: No such file or directory
grep: /home/vce/build/cache/sources/u-boot/master/Makefile: No such file or directory
grep: /home/vce/build/cache/sources/u-boot/master/Makefile: No such file or directory
grep: /home/vce/build/cache/sources/u-boot/master/Makefile: No such file or directory
[ o.k. ] Compiling u-boot [ 0 ]
[ o.k. ] Compiler version [ arm-linux-gnueabihf-gcc 6.3.1 ]
[ .... ] Checking out sources
error: pathspec 'HEAD' did not match any file(s) known to git.
[ o.k. ] Cleaning [ u-boot/master ]
[ o.k. ] Started patching process for [ u-boot rockchip-tinkerboard-next ]
[ o.k. ] Looking for user patches in [ userpatches/u-boot/u-boot-rockchip ]
make: *** No rule to make target 'tinker-rk3288_defconfig'. Stop.
make: *** No targets specified and no makefile found. Stop.
[ error ] ERROR in function compile_uboot [ compilation.sh:162 ]
[ error ] U-boot compilation failed
[ o.k. ] Process terminated
Thank you!