I have tried ip a command not installed, /etc/network/interfaces shows me dhcp & all values 0, resolv.conf 1.1.1.1 1.0.0.1
i think something wrong with name “eth0” , as in past it was something else surely not “eth0”. as my nuc is connected to different DDWRT repeater bridge router & that allotted in past some other name (i think name was like enp2s0f2). as my system reset with default values yesterday & come back to eth0. which never exist. please guide me how i am able to find that old network adapter name & we have to put that number instead of eth0 to make system workable. or we can override the old name with default value with “eth0” (preferable). this is my guess please guide me. i will do any of below provided option only after dietpi experts advice.
some where it is written available options
"You basically have three options:
You disable the assignment of fixed names, so that the unpredictable kernel names are used again. For this, simply mask udev’s .link file for the default policy: ln -s /dev/null /etc/systemd/network/99-default.link
You create your own manual naming scheme, for example by naming your interfaces “internet0”, “dmz0” or “lan0”. For that create your own .link files in /etc/systemd/network/, that choose an explicit name or a better naming scheme for one, some, or all of your interfaces. See systemd.link(5) for more information.
You pass the net.ifnames=0 on the kernel command line
"
sudo nano /etc/default/grub
GRUB_CMDLINE_LINUX=""
Change to
GRUB_CMDLINE_LINUX=“net.ifnames=0 biosdevname=0”
In past I have installed debian first on my nuc. after that run script dietpi installation to convert debian into dietpi system.
ok can you check following
journalctl -u ifup*
dmesg -l emerg,alert,crit.err
ip a
as well, did you created a backup somewhere in the past?
response of commands
ip a > -bash :ip command not found
dmesg > unknown level ‘crit.err’
journalctl > failed to add filter for units: no data available
there was a typo on the dmesg command
dmesg -l emerg,alert,crit,err
But not having ip command being available worries me. As well journalctl is not returning something. Does ifup eth0 at least do anything?
this command works “dmesg -l emerg,alert,crit,err”. after executing next line show up for next command. so commands executed correctly
alone journalctl works & 1000 of line show up
alone dmesg command works & 1000 line show up
ip a command not exist
ifup etho command not exist
my dell usb keyboard not able to write pipe “|” for dmesg less command
puuh this means you don’t have ip command as well as ifup?? This is more than bad as you will not be able to bring up the network interface without…
Still the question. Do you have a backup? As well can you check installation status of ifupdown package
dpkg -l ifupdown
It should looks like this
root@DietPi3:~# dpkg -l ifupdown
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-================================================
ii ifupdown 0.8.35 armhf high level tools to configure network interfaces
root@DietPi3:~#
Looks like you hit the same situation like this user https://dietpi.com/forum/t/removal-of-pi-hole-removed-ip-command-stuck-in-boot-net-wait/4976/1
sorry, dietpi is so stable i never think to backup anything.
with “dpkg -l ifupdown” same line showup as your but in table none for version, architecture & in description(no description available)
it need to have ii at the beginning, indicating the installation status.
Following 3 packages would need to be available
dpkg -l ifupdown iproute2 isc-dhcp-client
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with this command “dpkg -l ifupdown iproute2 isc-dhcp-client”
in table only shoup for ifupdown,
nothing for iproute2, isc-dhcp-client
one thing more, i have debian install live usb stick available if we can boot from it & repair dietpi. or you suggest better to reinstall everything again.
probably you removed iproute2 and isc-dhcp-client somewhere during your install/unstall procedure. I would recommend to reinstall all 3 packages. as you are offline with the system, you would need to download them on your computer and copy the packages via usb stick to your system. Let’s check the architecture you are running on
dpkg --print-architectur
cat /etc/apt/sources.list
thanks Joulinar,
Its look like i did multiple damage to standard operating system. so instead of repairing it i will reinstall everything again. it will almost same headache. what you suggest?
your could give it a try to download the 3 packages and have them installed. Should not be that complicate and maybe faster than reinstall whole stuf. If you still face issues, you are always good to start from scratch. And once back online, do a backup 
dpkg command show me error & others works, the output from both as this image. https://pasteboard.co/JZudsKU.jpg
sorry again a typo
dpkg --print-architecture
these are the 3 packages to download for amd64
https://packages.debian.org/buster/amd64/ifupdown/download
https://packages.debian.org/buster/amd64/iproute2/download
https://packages.debian.org/buster/amd64/isc-dhcp-client/download
download them on an USB stick and mount the stick on your DietPi system. Go into the mounted directory and install the packages using dpkg -i *.deb
I hope it is working this way and no other dependency are missing.
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during installation error come like this image https://pasteboard.co/JZumKhH.jpg
as unfortunately feared, you are missing some dependency.
Basically you would need to go package by package to have them all together 
If you start with iproute2, you would need as well libcap2-bin
please send me the link, i will download it & put in same folder with same procedure
let’s do it step by step and create 3 folder. This way we can avoid conflicts between the 3 packages
first one should contain iproute2 + libcap2-bin
https://packages.debian.org/buster/amd64/iproute2/download
https://packages.debian.org/buster/amd64/libcap2-bin/download
