high sierra – How to remove an 802.1x profile in OS 10.13 when Profiles does not show up in System Preferences?

I'm trying to delete an eduroam 802.1X profile that appears in the network preferences of OS 10.13.

The solutions I found online indicate that this can be done in Profiles, System Preferences. However, there is no Profiles icon in my System Preferences. What should I do?

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Differential Equations – How to solve my EDP system?

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hash – Is the current hashcash proof of work system vulnerable to computer attacks?

It has been some time since I got caught up in the post-quantum cryptography scene and I understand that RSA or ECC cryptography inherent in a cryptocurrency network can be easily destroyed by a sufficiently large quantum computer. I have however a more specific question …

Is the hashcash proof of work algorithm used by modern crypto-currencies vulnerable to quantum attacks?

Does the operating system affect speed?

All right, before I start, I want to say that my question is different from this one. Here is my problem, I bought a desktop and tried to change the hardware of the miners to speed things up. They were expensive from elsewhere. I created this PC running Windows Server 2016 with a graphical interface. However, I installed VirtualBox in Windows 2016 to run Ubuntu at home, but it is not very slow, but it is really very slow. For example, when I click on a folder, it may take a second for that folder to be highlighted or hovered over. Would it be different if I had Windows 10 instead of Windows Server!

If you want to know what the hardware is changing …

  • 500G Master SSD drive
  • 1T slave hard drive
  • 20.0 GB of RAM

Things are in the system

  • AMD Athlon X2 (2 CPU), ~ 3.4 GHz
  • 64 bits
  • Page file: 7067MB used 15844MB Available
  • Operating System: Windowns Server 2016 DataCenter 64-bit
  • 1G Graphics Memory

If Windows Server is not the cause, what hardware do you recommend to modify or add?

How to remove a system application from the Play Store Update List

I wonder how I can remove SwiftKey keyboard form the list of updates.

enter the description of the image here


  • This is a system application.
  • His deactivate The button is grayed out.

optimization – Optimize a system of equations to minimize purchase costs

I am new to this field (posting on stack exchange and higher level mathematics in general), so correct me if I am wrong. I try to minimize the costs for my company for the purchase of a certain product. We can get this product at different prices depending on what we buy at once (in "bundle"). We need to cover the total demand (TD) of the product and have enough packages so that each customer has 1 package (TL is essentially the number of customers that will also match the number of packages purchased) and even maximize the TD if possible. Each bundle contributes to the overall supply available, so that the individual needs of each customer are irrelevant because the product can be reallocated to different customers as needed, but the supply is important at the time of delivery. Purchase for us, the company.

So, I try to minimize the TC (total cost) in this case. TD and TL will be constantly updated every month, but these can easily be entered (here TD = 950 and TL = 195).

TD = 0.1 * x1 + 1 * x2 + 3 * x3 + 5 * x4 + 7 * x5 + 10 * x6

TL = x1 + x2 + x3 + x4 + x5 + x6

TC = 12 * x1 + 17 * x2 + 25 * x3 + 33 * x4 + 42 * x5 + 52 * x6

So, would the configuration look like this?

A =

| .1 1 3 5 7 10 |

| 1 1 1 1 1 1 |

| 12 17 25 33 42 53 |

b =


x =

[x1 x2 x3 x4 x5 x6]

What could be an appropriate approximation method to solve this problem? I try to avoid being mean, but I'm not sure where to start. Would the downhill slope suit something like that? Thank you

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database design – many-to-many assignments in the user system

I have some issues of software architecture / design related to a technically quite simple problem. We already have all the features implemented correctly, but from a design point of view, they are very complicated and confusing. That's why I would like to rephrase them with the help of a nice structure – that's the meaning of the question. Considering all the objects that I will define below, what should their interdependencies look like? Although we use a NoSQL database, my question is much more about the structures we actually have in the code than about any optimization based on the type of database we use. I will explain a simplified version of the problem to illustrate the problem.

Let's say I have groups / clubs and users.

Groups can have many users.

Users can be administrators or regular members of each group to which they belong.

In terms of modifying information from a more front-end point of view, I have the following needs:

  • When I look at a user, I must be able to see the list of groups of which he is a part, whether he is an administrator or a normal user (which I can then (un) assign, for example through a simple checkbox each group.)

  • When I look at a group, I want to see all users, but be able to distinguish between administrators and regular members.

  • When I look at a group, I need to be able to add users to it if I am a group administrator, as well as to assign their role (admin / regular).

  • Regular users should be limited to actions reserved for group administrators.

Even in this very small subset of features, there is already some kind of conflict when you look at specific implementations. For example, each group has a list of regular members and a list of administrators. Then I could very easily change the privileges of a given group; However, when editing a specific user directly, I should first get all the groups of which it is a part, then carefully edit only lists of members of specific groups. The opposite is true when the design is the opposite: the user having a list of groups of which he is a part / administrator.
You may also want to consider duplicating information, but this would pose a design problem in that you would need to update items twice. (Note that I always speak at a more abstract level, not necessarily how it is implemented in a database – although, optimally, the database structure should be the same as the logical one)

Whatever it is, I must always browse all possible users and see if they are part of the X group, for example, or browse all possible groups to see if the user has been part of it. of this group.

I hope my explanation was not too clear, but basically, I'm looking for advice on how best to structure the relationships between my objects in order to apply a strict logic model and make its implementation "clean".

Thank you!

Edit: To clarify, the structural problem we have is when it returns information to the customer. The customer must know the relationship between groups and users, as well as the role of the user. Therefore, when polling a group, where should I place the role information, knowing that I have a group structure with many users>. I do not want to put an isAdmin flag on users because this information is specific to the user group. combination, not the user himself. Similarly, when do we query all the groups to which the user belongs, where should I put the role information? The fact is that I want to remain consistent in both cases, without duplicating information.

System Installation – The laptop can not boot after clean installation to a single boot drive using ubuntu-18.04.2-live-server-amd64.iso

I can only offer the following observations:

  • laptop: an HP Elite book (6930p) with Intel Dual Core with only
    "UEFI startup experimental support". its bio setting: the UEFI mode is
  • I used Rufus 3.4 to burn an 18.04.2 server iso on a USB stick
    with "Partition Scheme" as MBR and Target System as MBR or UEFI.
  • the usb key can install the ubuntu server without any problem ("use all the disk" option)
  • after reboot, the system can not start


the same laptop can be properly installed and started in tty using:

  • mini.iso
  • old iso style server (ubuntu-18.04.2-server-amd64.iso)

The common point between these successful ISOs is the following: at the end of the installation, it invites you to write grub in the MBR. This process did not exist for live iso installation. During the live installation, all I got is a mandatory "bios_grub" partition of 1 MB that you can not modify or delete. I think the "bios_grub" is the same as the "write grub in the MBR". But the damn thing just does not start after installation.

Something weird about iso live-server?