Many thanks all. The problem has been resolved!!! Details is below.
I took a new Omega 2+, configured the wifi and ran opkg install gdb without issue, which tells me the issue is with your device. Can you post your /etc/opkg/distfeed.conf.
Here is my list of file /etc/opkg/distfeed.conf It configuration is works!!!:root@Omega-D913:~# cat /etc/opkg/distfeeds.conf #src/gz reboot_core http://downloads.lede-project.org/releases/17.01-SNAPSHOT/targets/ramips/mt7688/packages src/gz reboot_base http://downloads.openwrt.org/snapshots/packages/mipsel_24kc/base #src/gz reboot_onion http://downloads.lede-project.org/releases/17.01-SNAPSHOT/packages/mipsel_24kc/onion ## src/gz reboot_luci http://downloads.lede-project.org/releases/17.01-SNAPSHOT/packages/mipsel_24kc/luci src/gz reboot_packages http://downloads.openwrt.org/snapshots/packages/mipsel_24kc/packages ## src/gz reboot_routing http://downloads.lede-project.org/releases/17.01-SNAPSHOT/packages/mipsel_24kc/routing ## src/gz reboot_telephony http://downloads.lede-project.org/releases/17.01-SNAPSHOT/packages/mipsel_24kc/telephony src/gz omega2_core http://repo.onion.io/omega2/packages/core src/gz omega2_base http://repo.onion.io/omega2/packages/base src/gz omega2_packages http://repo.onion.io/omega2/packages/packages src/gz omega2_routing http://repo.onion.io/omega2/packages/routing src/gz omega2_onion http://repo.onion.io/omega2/packages/onion
I can't help but comment that after 30 years writing C and ASM code, I consider gdb to always be a last resort. Logging is your friend, search for my response on how to set up a remote logging server for your Omega. I have 80+ devices, all running my own custom applications, and there is nothing I need to know about these devices that I cannot understand using logging, or by listening on wireshark.
You are hero. Logging, asserts, tracing are good instruments, but I drop much time to find errors without Debugger. The debugger is more perfect instrument for me. And I'm codding in C++ - it's need powerfull IDE such as Visual Studio or Eclipse, because C++ syntax is too difficult for a simple text editor.
By the way. The problem was links with different versions of Kernel and Packages. Default repository downloading packages from the OpenWRT v. 19xx, but the Onion OS is based on version 18.06.
Now I'm installed gdb and gdbserver. Both of them are already tested and works! Subject can be closed.