Hello,
im new and im bad in English so sorry for translation mistakes :x

I have an Linux Server with Proxmox running. Yesterday i tried to install a Virtual Windows Machine and changed to download the iso file the directory Permissions.
I switched into the folder to download the file and stupidly executed the command 'chown -R seba /' to change the permission of the Directory i'm inside but the command done some stupid things :x

Since i disconnected i didn't get into the Proxmox Interface and cant switch into the Root account. SUDO Commands are not usable '-bash: sudo: command not found'

The User Seba where i still can get in should be inside the SUDO Group. Maybe it helps. I've redone the command upper with 'chown -R root /' But recieve only 'not permitted...'

The Directorys i've already checked are all owned by root.

I hope someone here can help me. On this Core are 3 Containers with GameServers running.

chown -R root / won’t help you, since there are many files and directories that should not be owned by root.

Your situation doesn’t make sense to me. You changed ownership of the entire filesystem, yet the directories you checked are owned by root? How this is related to not finding sudo is not clear to me either.

A bit more clarification, please:

What Linux distro is this?
Which directories have you checked?
What are the permissions and ownership of the top directories right under /?
sudo should be /usr/bin/sudo. Does it exist? If yes, what are its permissions, and what is the content of your PATH variable?
Have you tried running su instead of sudo?

Linux: Debian GNU/Linux 9 (stretch) - SMP PVE 4.15.18-27 (Wed, 10 Oct 2018)
Checked Directories: Bin, Boot, dev => all owned by root, some directories onwed by another group like /dev/kvm => group: disk
Permissions for alle Folders in TOP-Directories /: root:root
Sudo in /usr/bin/sudo doesn't exists.
'su root' to switch user doesnt work with the error 'Authentification failed' after entering a password. The password is right. Its saved in a DataTable and directly copied into the terminal. Still worked everytime.

Commands like 'su apt-get update' says: no user with apt-get


The Server can be started inside the rescue mode, if it helps.

Your chown command did not change groups.

If /usr/bin/sudo doesn’t exist, search the entire filesystem for it.

I do have the feeling that other things than chown -R seba / happened if the root password doesn’t work and sudo has disappeared.

su apt-get wants to switch to a user named apt-get, which obviously doesn’t exist. This command reacts normally.
I don’t know what went wrong here, so I am at a loss to tell you what to do. Perhaps changing the root password and reinstalling sudo, but I fear there are other problems.

We solved the Problem. We startet the Server in the Rescue System.

Now we Mounted the md2 into mnt.
Here we changed the Folder Permissions and the Folder Owners to root.
We also changed the root password to the same again and restartet the server. It was tricky to change the Permissions back again because we also most became the Answer "Operation not permitted" but after many tries we still found a way inside the rescue to repair it. After a successfull restart all Systems are running again.

Thanks for your try and sorry for losing your options to answer :x

Switch state to solved.