WARNING: petalinux-user-image-1.0-r0 do_rootfs: [log_check] petalinux-user-image: found 1 warning message in the logfile:
[log_check] warning: %post(sysvinit-inittab-2.88dsf-r10.plnx_zynqmp) scriptlet failed, exit status 1

这个错误，赛灵思官方说是可以忽略的。
关于原因详见解决

2019-3-11更新
在这个错误的影响下，我们可能必须要升级到2018.3了。在2018.3中修复了上面的警告并且在新文档第7章Building User Applications中删除了petalinux-build -x do_populate_sysroot命令。
2018.3特性和bug修复：
2018.3 New Features:

PetaLinux

Added support for using the trim version of XSCT tools to build components such as FSBL, PMUFW etc.,.
Added support for Programmable Logic (PL) device tree overlay.
Added support for FPGA Manager utilities.
PetaLinux now uses only versionless drivers from https://github.com/Xilinx/embeddedsw which means that /components/plnx_workspace will no longer have fsbl/pmu-firmware/fs-boot directories.
For more details refer to (UG1144). It is now similar to other open source components like U-boot and Linux.
SDFEC Design Example is part of the ZCU111 PetaLinux BSP.
Added support for RHEL 7.5 and CentOS 7.5 build host.
GPU MALI-400

Added Wayland compositor and GBM buffer management support in MALI user space libraries for 32 and 64 bit mode.
Added support for Displayless EGL rendering for MALI binaries.

2018.3 Bug Fixes:

PetaLinux

Fixed RFDC build issues when using a custom ZCU111 HDF on top of xilinx-zcu111-v20XY.Z-final.bsp.
Linux reboot command does not work when TRACE port is present in the design.

Fixed do_populate_sysroot task for petalinux-user-image recipe.

PetaLinux installer fails to installs when /tmp directory has restricted access.
PetaLinux FIT image does not boot when image.ub size is larger on a ZC702 board.
Linux hangs when using lower 36-bit physical memory from petalinux-config option.
Fix for boot login console taking more than 8 minutes with 2018.2 based rootfs.
GPU MALI-400

Fixed YUV format issue where the TEX_WIDTH is being interpreted differently than expected.

=========================================================
欢迎各位使用PetaLinux系统的小伙伴加入群，分享经验，后期会逐渐有大佬加入，以后有问题时，多加一个群多一个求助途径。当问题开源后，将比项目开源更能节省琐碎时间。欢迎各位加入。