18.04 – Guest Additions Do Not Work Even After Uninstalling and Reinstalling

I am using Ubuntu 18.04.3 as a guest on VirtualBox. But there was an error during the make for the 5.1 kernel update. I had this code of error

Building the main Guest Additions 6.0.12 module for kernel 5.1.0.
Error building the module. Build output follows.

Then I uninstalled the guest additions from / opt and then reinstalled. He installed without error displayed. But I still can not go full screen. What to do?

Some parts also work: I can copy and paste both ways.

Reinstalling Mac OS on an iMac 2011 with Windows 7

So I installed Windows 7 on my iMac 2011 a few weeks ago and now I want to install macOS Sierra on this one. I had macOS El capitan before.

I've created a bootable USB disk with macOS on it, but when I enter the "disk selection" "now alt during boot"

But I can not find the bootable USB disk, the only thing I get up is my main disk "Windows"

I also want to install macOS on an external drive, but I have heard that it could result in complications, because Windows would then be on the main drive.
I will just install Windows on the external drive after, seems to be a smarter option.

So, what I did with the bootable USB disk, I converted it to GPT, and then I used the TransMac program to install macOS on the USB device.

Does anyone have any idea why I do not find it in the "disc selection" screen?


NVIDIA-SMI failed because it could not communicate with the NVIDIA driver. (even after reinstalling the driver)

I had encountered a problem on the nvidia driver for 2080Ti (need to install the driver nvidia + CUDA for the use of the torch).

me@server:~$ python3
Python 3.6.8 (default, Aug 20 2019, 17:12:48)
(GCC 8.3.0) on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import torch
>>> torch.cuda.is_available()

I think this problem is caused by the following problem:

me@server:~$ sudo nvidia-smi
NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver.
Make sure that the latest NVIDIA driver is installed and running.

Of course, I had looked a lot on this subject in Google and I had tried all the solutions found: I had reinstalled all the drivers from scratch, tried different versions of the drivers (385, 410 , 415, 430, 435). Unfortunately, all these steps did not help.

I need something fresh on the solution 🙂

P.S. Of course, reinstalling Ubuntu will work, but for now, I do not have time to do it because I need to run torch 🙁

Reinstalling Windows 10 on the iMac mid2011 with Bootcamp

I guess you have a bootable Windows 10 pen drive with Mac drivers.

I have not read any tutorial to do this, here is what I would try to try given your situation (considering that I have already installed Windows a few times on several different Macs for the game).

I would try to continue with the start up wizard, even if Windows 8 is mentioned, that I am all the end and that I ignore all the steps you do not need, just so that it creates the partition you need.

Windows 8 drivers can run on Windows 10, but if you already have some, skip it too (leave it unchecked). Do not insert or let the wizard erase or do anything on your bootable USB stick.

Then when the Mac restarts, insert your USB drive with the Windows installation. If your Mac does not automatically start the USB key, reboot again by holding down the Option key and select the USB key.

Install Windows normally on the partition created by the Bootcamp Wizard, then install all drivers manually, in case this is not done automatically.

Reinstalling Windows 10

I bought a laptop with Windows 10 licensed. Then I installed Ubuntu and deleted Windows. I want to reinstall Windows 10. How to activate it with the old license key?

Previously, Windows 10 was linked to my Microsoft account and contained the digital key.

applications – Is there a difference between updating and reinstalling Android apps?

I keep automatic updates in Google Play to make sure my phone's apps are always up-to-date. A few days ago, I put my phone rooted, which resulted in a factory format. After reinstalling all the apps I had before, I noticed that some apps were a little different, some seemed different and some had new features. None of these applications released new versions that day. So now, I wonder if the update and reinstallation will cause differences for Android apps.

Can Android malware persist after reformatting / reinstalling?

Something similar to this happened recently.

Depending on the actions suggested in the post:

  1. Take the device from the dealer and ask him to explain what these messages are. If they can not solve it, ask for the contact details of their security service.

    Contact the device service provider security service. Have them monitor suspicious activity on the account and traffic or send them the device for image creation. Their equipment is endangered instead of owning you.


  1. Do not connect the device to a computer; not even for forensics! I've already heard a horror story that did not end well when an infected phone touched a PC via a USB stick.

    Do not allow it on your local Wi-Fi network. Although I have not seen any malicious programs to cross Wi-Fi in the wild (between phones and PC), I have tested if possible on Android and it's not difficult … on my own devices only ( I'm not a distributor) you can read about it on Stack Overflow where I explained how to run Android with Metasploit.

The first is virtually impossible since I was out of town and I was using a different service provider when that happened and the message was apparently sent by the service provider.

Now, I wonder if it is possible that malware from Android is hiding in the hardware firmware, as in some cases with a laptop keyboard or BIOS to survive the reinstallation?

Is it safe to back up the files in the phone and simply perform a complete reinstallation?

Amazon Web Services – Removing and then reinstalling Anaconda on an AWS Ubuntu Deep Learning EC2 instance and unable to enter in-depth learning environments

I just set up an Ubuntu Deep Learning AMI EC2 instance. I am a beginner on AWS / Packet Processing.

My goal is to use the instance to run a Python deep learning script. This script uses a variety of packages.

When installing some of these packages with conda, an error has occurred indicating inconsistencies in the environment for more than 100 packages. After several attempts to solve this problem, I thought that removing Anaconda and reinstalling it could do the trick. After that, I realized that I had perhaps further spoiled my instance. I can no longer use the predefined deep learning environments for which the AMI has been configured because they have been accessed using conda commands, which seems to have been removed (IMO).

I've tried repeating the commands, but I get an error stating that these environments no longer exist. A tutorial using these commands is mentioned here:

active source tensorflow_p36

I was expecting the above to enter the tensorflow_p36 environment. A sin:

(tensorflow_p36) ubuntu @ ip-172-31-45-96: ~ / scripts

However, this gives an error message:

impossible to find the environment: tensorflow_p36

I realize that the uninstallation of conda was a major rookie error that seems to have totally disabled my instance. If anyone has any ideas to get it back, it would be very appreciated!

thank you so much

Unable to decrypt the encrypted home directory after reinstalling Ubuntu 18.04 (fscrypt)

I've encrypted my / home / directory on Ubuntu 18.04 by following http://tlbdk.github.io/ubuntu/2018/10/22/fscrypt.html

Due to an update failed, I had to reinstall.

As I had / home on a separate partition, I first tried reinstalling with reuse of the / home partition. Unfortunately, it did not work. I could not connect. No warning, return to the login screen.

So I did an install on a partition, using the same username and password as before, and manually mounted the old / home partition and tried to Decrypt my old / home directory with the help of fscrypt unlock, but that fails.

Fscrypt status of my home directory:

fscrypt status aak
"aak" is encrypted with fscrypt.

Policy: 5a49d89d52d640f9 Unlocked: No

Protected with 1 protector: PROTECTOR BOND DESCRIPTION
                    [filesystem /mnt: no device with UUID "e2a3115b-7111-4cb8-ac31-966baea755c3": cannot follow filesystem link]

And when I try to unlock it:

aak @ aak-XPS-15-9570: / mnt $ fscrypt unlock aak --verbose
2019/07/06 11:43:22 keyringID (_uid.1000) = 251180423, 
2019/07/06 11:43:22 KeyctlLink (251180423, -2) = 
2019/07/06 11:43:22 keyringID (session) = 753358341, 
2019/07/06 11:43:22 KeyctlSearch (753358341, keyring, _uid.1000) = 251180423, 
2019/07/06 11:43:22 Reading the configuration of "/etc/fscrypt.conf"
2019/07/06 11:43:22 context creation for "aak"
2019/07/06 11:43:22 aak is on the ext4 file system "/ mnt" (/ dev / nvme0n1p9)
2019/07/06 11:43:22 performing mental health checks
2019/07/06 11:43:22 The /mnt/.fscrypt/policies directory has incorrect permissions.
2019/07/06 11:43:22 The /mnt/.fscrypt/protectors directory has incorrect permissions.
2019/07/06 11:43:22 found the policy 5a49d89d52d640f9 for "aak"
2019/07/06 11:43:22 The /mnt/.fscrypt/policies directory has incorrect permissions.
2019/07/06 11:43:22 The /mnt/.fscrypt/protectors directory has incorrect permissions.
2019/07/06 11:43:22 were able to read the metadata in "/mnt/.fscrypt/policies/5a49d89d52d640f9"
2019/07/06 11:43:22 found the policy data 5a49d89d52d640f9 on "/ mnt"
2019/07/06 11:43:22 file system data and path of access
2019/07/06 11:43:22 KeyctlSearch (251180423, logon, ext4: 5a49d89d52d640f9) = -1, key required not available
2019/07/06 11:43:22 The /mnt/.fscrypt/policies directory has incorrect permissions.
2019/07/06 11:43:22 The /mnt/.fscrypt/protectors directory has incorrect permissions.
2019/07/06 11:43:22 optionFn (5a49d89d52d640f9)
2019/07/06 11:43:22 selection of a protector
2019/07/06 11:43:22 when loading the option: file system / mnt: no device with the UUID "e2a3115b-7111-4cb8-ac31-966baea755c3": impossible to follow the file system link
fscrypt unlock: unable to load protectors

You may need to mount a linked file system. Run with --verbose for more information.

Any help appreciated.

el capitan – I can not exit recovery mode (OS X Utilities) by resetting or reinstalling the OS

I have purchased a used iMac and, when I turn it on, the OS X Utilities screen appears. I would like to install the operating system but I can not do it.

I have tried everything on any other questions on this topic:

  1. Back to factory settings

That is to say. formatting the hard drive (as indicated by Apple) and reboot. According to the Apple website, this was supposed to display the country selection screen, but this is not the case. It just takes me back to OS X Utilities.

  1. OS X Resintall

There is an option to reinstall OS X El Capitan. After being connected to iCloud (with a new account, I had to create this – I did not have one before), the error message "This item is temporarily unavailable". I've googled this and tried the many fixes to no avail. Apparently, the iCloud account of the original user should be used, but I do not have access to it and I do not want them to be linked to this computer either.

  1. Other macOS recovery modes

Apple gives key combinations for other recovery options. I have tried all three as shown, but I am still asked to enter the details of iCloud.

  1. Start from CD

I do not have the original CD with the operating system on it, nor access to a computer capable of burning a bootable disc. To be honest, this is not an option I want to consider – resetting an Apple computer does not require it, according to the many guides and videos on this subject.)

Screenshots of the formatting of the hard disk:

Format the hard drive

Formatting successful

Screen capture of the iCloud error:

ICloud error