New user has appeared on my Macbook Pro

Today I noticed the addition of a new user “Linchengzhang” on my MacBook pro. Apparently the user was added 25th April 2019 (according to the folder creation) and it appears to have an identical structure as those described in this postand this post. I don’t know how they managed to structure their files so they could grab all the directory in a screenshot, but if anyone knows and needs to to see it, let me know.

Interestingly, they do not show up in “users and groups”, so I don’t think they’re really classed as a user, but they are placed in the “Users” subdirectory.

As it’s mentioned in the first post I’ve linked I do have to say that this mac has been sent away for repairs to Apple on 8th April 2019.

I do download a lot of software from a lot of places as I’m a bioinformatics student working on many different projects and so I can’t rule out that I’ve downloaded something suspicious. I’m curious as to the fact I haven’t noticed it until now, I spend quite a bit of time moving between directories and it’s not unusual for me to accidently wind up in the Users directory when I go one or two too far back.

It seems quite suspicious to me (as a non-information security professional) and I was wondering a) what you all think and b) what do I do about it?

which macbook for Matlab/programming/computing science

I would like to know which MacBook Pro (2019) is more suited for MatLab (finite element methods for PDEs stuff), programming (in C, related to PDEs stuff) which I can use for 5++ years.

I would like a solid machine, but obviously I do not wish to spend money on specifics I will never use. Note that I won’t use the mac for graphic/editing/gaming stuff, but rather for scientific/computing/programming tasks.

MacBook 2.1 late 2006 issues with installation of Ubuntu 18.04

I rescued an old MacBook 2.1 late 2006 13″ from my job. After a deep search of couple days I found this video who help me to install ubuntu 16.02 on my old macbook laptop. Now, I’ve been trying to install ubuntu 18.04, unfortunately after the installation ( it looks like everything went well during this process) after first reboot the laptop cannot start the OS, first started with a black screen and when I forced pushing the turn on botton, I can see the system loading the OS again, but the screen goes to a pink-violet screen and the OS never comes up.

I really want to make an use of this old laptop and see if i can upgrade the Ubuntu version,I will appreciate if someone can help me.

Thank you!

Ubuntu boot option not showing on my macbook air unless an unrelated USB is plugged in

I tried to install Ubuntu on a 256g flash drive but it didn’t want to cooperate, so I ended up partitioning out 75g of my mac SSD for Ubuntu. I installed it fine, except when I hold option at boot to select it, I discovered it doesn’t show an option to boot into Ubuntu unless the prior flash drive (which I formatted after failing to install to it) is plugged in for whatever reason.

I saw threads saying that ubuntu can be fiddly in terms of showing up, and I tried installing rEFInd and encountered other errors.

Are there other ways to make Ubuntu visible in the boot menu? And why does a formatted flash drive make it appear?

Try Ubuntu Without Installing Macbook 2011 8.2

I am in the middle of trying to resolve the dreaded Radeon issue with the 2011 Macbook pro. I have created a bootable USB stick with everything I should need to eventually disable the Radeon GPU ahead of removing a sensor to complete the job. I am using the ubuntu-16.04.3-desktop-amd64.iso

There a couple of modifications to the created stick, with a new grub.cfg file to replace the existing one and the addition of a file in the root of the stick to disable the GPU

When I boot into the stick, I select Try Ubuntu Without Installing, but it sits at a black screen and does nothing. Mine doesn’t look exactly like images I have seen, with a * appearing before the words Try Ubuntu……

Any help gladly accepted

By the way, I have already seen to type e after selecting Try Ubuntu…… but nothing happens when I do that; no possibly to edit at that point

Wired Connection not working with Parrot OS booted on Macbook Pro 2016

I dual booted my mac with Parrot OS. I have perfectly fine wireless connection but Ethernet is not recognized. When I installed the system, it said that the Ethernet card could not be identified and asked me to choose one from the list. I thought I could probably just fix it later so I said no network. Is there any way to install the correct driver onto Parrot (which is Debian based)?


cat /etc/network/interfaces

# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5).  source /etc/network/interfaces.d/*  # The loopback network interface auto lo iface lo inet loopback 


lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536     inet  netmask     inet6 ::1  prefixlen 128  scopeid 0x10<host>     loop  txqueuelen 1000  (Local Loopback)     RX packets 6540  bytes 416615 (406.8 KiB)     RX errors 0  dropped 0  overruns 0  frame 0     TX packets 6540  bytes 416615 (406.8 KiB)     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0  wlan0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500     ether 26:7e:42:4c:53:52  txqueuelen 1000  (Ethernet)     RX packets 31337  bytes 31058922 (29.6 MiB)     RX errors 0  dropped 0  overruns 0  frame 0     TX packets 23980  bytes 5218400 (4.9 MiB)     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0  wlan1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500     ether 96:ab:7b:be:6b:71  txqueuelen 1000  (Ethernet)     RX packets 0  bytes 0 (0.0 B)     RX errors 0  dropped 0  overruns 0  frame 0     TX packets 0  bytes 0 (0.0 B)     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0 


Microsoft Sculpt keyboard not working with 2018 MacBook Air

I have a brand new Microsoft Sculpt keyboard and mouse, and a 2018 MacBook Air. The keyboard works only occasionally, and often stops after a few keystrokes. The behaviour is either to not work at all, severely lag, or drop most keystrokes.

The USB receiver is plugged into a hub. I’ve tried the hub and keyboard on another computer and it works perfectly, so I assume there is no issue with either of them.

I’ve also tried swapping the hub to the other port on the MacBook Air, and I face the same issue.

What else can I try?