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Edit net.ipv4.ip_local_port_range in /etc/sysctl.conf with: sudo nano /etc/sysctl.conf or any other editor of your choice and add or change: # Allowed local port range net.ipv4.ip_local_port_range = 1024 20000 Restart your network.
OS Memory v. Ubuntu Memory v. Kernel Memory You have asked to know how much the "Linux OS" is using (and not how much memory is being used by "applications"). "Linux" is just a kernel (albeit not a monolithic one; kernel modules contribute to the effective footprint). Many things that end users see as "the OS" are not part of the kernel, but part of the ...
I recommend you download a LiveCD version of Linux and burn it to a CD or DVD, then boot from that. It should be able to read the Linux-formatted drive and transfer your data to a USB stick or send it somewhere over the network.
I have solved this one way by creating a further sub directory in the user's home directory, which is owned by them. The home directory itself is still owned by root. So the user can do whatever they like in their subdirectory.
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