I used Ubuntu18.04 + Vivado 2019.1 + Petalinux2019.1 to build PYNQ v2.5 SD image for Zedboard followed instruction - PYNQ-2.4 for Zedboard v2018.3
but I got errors when building SD card image:
Err:1 http ://ports.ubuntu.com/ubuntu-ports bionic InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Reading package lists… Done
W: GPG error: http ://ports.ubuntu.com/ubuntu-ports bionic InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository ‘http ://ports.ubuntu.com/ubuntu-ports bionic InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
apt update failed. Exit value: 100
Makefile:322: recipe for target ‘/opt/Xilinx/Documents/PYNQ-2.5/sdbuild/build/bionic.arm.stage1.img’ failed
make: *** [/opt/Xilinx/Documents/PYNQ-2.5/sdbuild/build/bionic.arm.stage1.img] Error 25
I checked my network, added public key of ports.ubuntu.com, and tried many times, but didn’t work. Anyone can help me? 