1bfa0a5cdSXianjun Jiao# Known issue 2bfa0a5cdSXianjun Jiao 3d971c386SJiao Xianjun- [Network issue in quick start](#Network-issue-in-quick-start) 4*d2ed8f98SJiao Xianjun- [EXT4 fs error rootfs issue](#EXT4-fs-error-rootfs-issue) 5d971c386SJiao Xianjun- [antsdr e200 UART console](#antsdr-e200-UART-console) 6a17e30c7SXianjun Jiao- [Client can not get IP](#Client-can-not-get-IP) 7bfa0a5cdSXianjun Jiao 8d971c386SJiao Xianjun## Network issue in quick star 9bfa0a5cdSXianjun Jiao 10bfa0a5cdSXianjun Jiao- OS: Ubuntu 22 LTS 11bfa0a5cdSXianjun Jiao- image: [openwifi img](https://drive.google.com/file/d/1fb8eJGJAntOciCiGFVLfQs7m7ucRtSWD/view?usp=share_link) 12bfa0a5cdSXianjun Jiao 137ac12f7cSJiao XianjunIf can't ssh to the board via Ethernet for the 1st time, you might need to delete /etc/network/interfaces.new on SD card (on your computer). 147ac12f7cSJiao Xianjun 1542e8e675SJiao XianjunIf still can't ssh the board via Ethernet, you should use UART console (/dev/ttyUSBx, /dev/ttyCH341USBx, etc.) to monitor what happened during booting. 16d971c386SJiao Xianjun 17*d2ed8f98SJiao Xianjun## EXT4 fs error rootfs issue 18*d2ed8f98SJiao Xianjun 19*d2ed8f98SJiao XianjunSometimes, the 1st booting after flashing SD card might encounter "EXT4-fs error (device mmcblk0p2): ..." error on neptunesdr, changing SD card flashing tool might solve this issue. Some tool candidates: 20*d2ed8f98SJiao Xianjun- gnome-disks 21*d2ed8f98SJiao Xianjun- Startup Disk Creator 22*d2ed8f98SJiao Xianjun- win32diskimager 23*d2ed8f98SJiao Xianjun 24d971c386SJiao Xianjun## antsdr e200 UART console 25bfa0a5cdSXianjun Jiao 26dcda3265SJiao XianjunIf can't see the UART console in Linux (/dev/ttyUSB0 or /dev/ttyCH341USB0), according to https://github.com/juliagoda/CH341SER, you might need to do `sudo apt remove brltty` 27a17e30c7SXianjun Jiao 28a17e30c7SXianjun Jiao## Client can not get IP 29a17e30c7SXianjun Jiao 30a17e30c7SXianjun JiaoIf the client can not get IP from the openwifi AP, just re-run "service isc-dhcp-server restart" on board and do re-connect from the client. 31