Multiboot system - help with troublehooting

[anneranch]

Is there a way to start / run another OS while the current one is running?
i like to retrieve log of faulty OS.

[QIII]

Unless you are running a virtual machine: no, not on the same machine.

How do you intend to retrieve a log from one running OS by using another? SSH, perhaps? Run another OS and mount the drive the other OS is installed on?

[coley9225]

I'm no expert, but have you considered using a live usb for your operating system, then mount the necessary partition(s) and access files from there? A live usb should give you access to you hard drive so you can find your files.

[anneranch]

I have experiences total crash after running "sudo apt update" and was trying to
capture the outputs from repository instigating the crash.
But it seems futile to even try , so for now I am concentrating on fixing it.
I have found solution , but since my original post got closed, for oblivious lack of concerns , i am not going to pursue this any further.
I will only say the "closer" was correct - it was my fault for switching to 21.04 - 18 works flawlessly.

SOLVED AND CLOSED ( for lack of interest )

[QIII]

1. That is not what coffeecat said.

2. You can't close the thread, but I can. So I am doing that. Would you like me to close the rest of your threads since this community is so woefully incapable of fulfilling your needs? I can also disable your account(s) and be done with it.