Score: 2
Shubham Deshmukh avatar
Is shim a redundant package that is never used, compared to shim-signed?
jp flag

I did sudo apt-get autoremove --purge to free up some space, however it also removed the latest shim package that got updated just today.

shim (15.4-0ubuntu7)

also updated today was

shim-signed (15.4-0ubuntu7)

but shim-signed was NOT removed.

If autoremove removes older versions no longer required, however I believe shim is an essential element for secure boot process, or is it not? Please help me ...

Score: 0
can't upgrade a package... it wants to delete everything
pg flag

I get "The following packages have been kept back"

sudo apt upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  libgbm1:i386 libgl1-mesa-dri:i386 libglapi-mesa:i386 libglx-mesa0:i386
  libosmesa6:i386 mesa-vulkan-drivers:i386
0 upgraded, 0 newly installed, 0 to remove and 6 ...
Score: 0
mert avatar
Ubuntu 18.04 booting is stuck at GNU GRUB version 2.04 [Partially solved]
cn flag

Dear fellow ubuntu Users,

I have an Alienware laptop that has a dual boot with Windows 10 and Ubuntu 18.04. I use Ubuntu as my main operating system. After a fail in booting, I used boot-repair program from an Ubuntu 20.04 via live USB. (for the previous part of the problem that caused me to run boot-repair, see my other question)

After removing the USB and booting again caused me to run into Grub mi ...

Score: 0
Cara Summerfield avatar
VLC, as default video player, still not playing videos automatically out of Thunderbird
co flag

I have made VLC my default media player, but it still won't automatically play my videos sent in Thunderbird email. I have Ubuntu 20.04. How do I fix this problem? Thank you.

Score: 4
In AWS, can an EC2 instance be in more than one VPC at the same time?
lk flag

I think the answer is no, but I want to make sure that I'm not missing anything. Is it possible for an EC2 instance to have IP addresses in more than one VPC at the same time?

I tried creating 2 VPCs, and then two network interfaces, one in each VPC, but it seems it's not possible to attach them to the same EC2 instance because it's not possible to attach them to an instance that's not on that VP ...

Score: 0
OpenDkim install on Docker fail
in flag

I have a docker container, and I have installed postfix successfully, but I can not install OpenDKIM successfully.

I tried the command service OpenDKIM status, get this error opendkim is not running

I refered following link to install OpenDKIM

*My docker Linux version as follow:

VERSION="20.04.2 LTS (Focal Fossa)"
ID_L ...
Score: 0 avatar
vSphere PortMirror: What does "Source/Destination" mean as in "Remote Mirroring Source" and "Remote Mirroring Destination"?
us flag

The following is from vSphere's admin doc:

To begin a port mirroring session, you must specify the type of port mirroring session.


  1. Browse to a distributed switch in the vSphere Client navigator.

  2. Click the Configure tab and expand Settings.

  3. Select the Port mirroring option and click New.

  4. Select the session type for the port mirroring session.

    Option Description
    Distributed Port Mir ...
Score: 1
J.Doe avatar
A SHA verifier in the CNF format
br flag

Can someone help tell how to generate a 3-CNF verifier for SHA-256 that:

  1. outputs 1 if message/input's calculated SHA-256 value matches the pre-provided hash
  2. Otherwise outputs 0.

Given that the message can be arbitrarily long we can assume it to have a finite length (say 2 MB) to make our task simpler.

Score: 0
Aarav Prasad avatar
Encrypt folder with password commandline
kn flag

I have a 20.04 Ubuntu box that I have shared with other users. We all have the same privilege (root). I want to encrypt a folder with a password that contains personal details so someone can not accidentally wander off into it, how could I do so?

Score: 0
JoBe avatar
Squid! FATAL: No valid signing certificate configured for HTTPS_port
ng flag

I've been struggling with Squid 4.13 on Ubuntu 20.04 for about a week now.

My latest (and hopefully last) problem is this:

FATAL: No valid signing certificate configured for HTTPS_port

and this is my line that says so:

https_port intercept ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=4MB cert=/usr/local/squid/etc/rootCA.crt key=/usr/local/squid/etc/rootCA.key option ...
Score: 0
Spratty avatar
AD account for monitoring services across servers
bq flag

We have some Windows servers that run various services and we have a situation where sometimes those services just stop. To monitor these services I have written a Windows service that uses the ServiceController to look at the suspect services and check their current status. This works fine when I configure the new service to run under an account which has local admin permissions to the servers in quest ...

Score: 0
Apache2 mod_userdir+mod_authnz_external, how to limit access to own home
de flag

I have an Apache2 setup with mod_userdir and mod_authnz_external+pwauth so that each user can access his home and can be authenticated by his local UNIX credentials.

Now I need some kind of authorization so that each user can, after being authenticated, only access his own home directory, but not those of other users.

The caveat: in my setup, a user is not necessarily the owner of his home directory, so ...

Score: 0
Debugging "upstream prematurely closed FastCGI request while reading upstream"
us flag

I am running an nginx + php-fpm setup. I recently ran into problem returning binary data to the Nginx server. Nginx show this in the error log:

2021/08/04 19:22:27 [error] 996463#996463: *1 upstream prematurely closed FastCGI request while reading upstream, client:, server:, request: "GET /somemedia.mp4 HTTP/2.0", upstream: "fastcgi://unix:/run/php-fpm/www.sock:", host: "foo ...
Score: 1
Harman Kajla avatar
How do I setup a bluetooth dongle in my Ubuntu 20.04
us flag

I recently bought a USB dongle for Bluetooth. It worked on my Windows 10 but in ubuntu, it is not showing anything. I tried using Blueman but my device headsets keep disconnecting in 5-6 mins. Please Help Me

Thanks in Advance :)

Score: 0
Milo avatar
how can we run DNS in Python?
cn flag

I was using DNS Jumper to run DNS. I wanted to know how to write a script to do this.

For example:

import DNS DNS.set("", "") #

Or if you know a module, introduce it

Score: 3
Frank Nocke avatar
Ubuntu-MATE: make USB Sticks automount available to every user (udev rules?)
in flag

I want every USB media (ext, ntfs, FAT…) inserted to be available with full read-writable to every user. Preferably under mnt and as group common.

( Ubuntu-MATE 21.04, though my issues actually date back even to Ubuntu-MATE 16.04...)

  1. I boot into my machine as user frank. When I mount an USB drive (FAT) it ends up under /media/frank/4C8C-E4BC – just fine, as it should. When I switch to another  ...
Score: 0
Manuel Oliveira avatar
Invalid MIT-MAGIC-COOKIE-1 key in Ubuntu 20.04
cn flag

When I run a program in parallel with MPI, in Ubuntu 20.04, I get the statement:

Invalid MIT-MAGIC-COOKIE-1 key

What is this? Is it impairing something on the program execution? How can I correct it?

Score: 0
VagrantPaladin avatar
Apache Config file blank
in flag

I have a server hosting many sites, many of which have SSL set up.

For these the SSL config are held in a separate config file, being /etc/httpd/conf/httpd-le-ssl.conf

This has been in use and working for a long time - SSL certs are updated using the Lets Encrypt certbot utility

Yesterday I found that the SSL config file was suddenly blank (It should have in the region of 3000 lines)

While finding a ba ...

Score: 0
robotsfoundme avatar
prevent closing terminal window from stopping task started with "&"
es flag

I can start a command in the CLI interface and have it run in the background using the "&" symbol. Here, I start a command and hide all stderr and stdout and also send it to the background:

/home/$USER/xctu/XCTU-NG/app &> /dev/null &

When I close the terminal that ran this command, the program also quits. How do I close the terminal window that ran this command without quitting the prog ...

Score: 0
Ivan Ginovski avatar
Display Node Local Tasks Menu on View
jp flag

I have a view that shows registrations for an Event (Content Type). This tab is shown in the /node/{node}/edit:


This registrations tab refers to the view, which I have inserted in the routing.yml:

  path: '/node/{node}/registrations'
    _entity_view: 'registrations.page_1'
    _custom_access: '\Drupal\events\Access\EventsRegistrationsAccess::checkAcc ...
Score: 0
Springnuts avatar
Error on boot of dual boot HP455 - start_image returned invalid parameter
de flag

Good morning all.

The laptop is an HPP455 G2 with a 1TB SSD partitioned to include a separate Data partition. Secure boot is disabled. I have installed a dual boot Windows 10 and Ubuntu 21.04 system and (with some difficulty) had it working well.

Expected behaviour: On switch on or restart the system boots into the Ubuntu dual boot screen, allowing user to select Ubuntu or Windows; if no selection ...

Score: 0
Titanlord avatar
Linking attacks on anonymized data
tl flag

I'm working on a anonymization project and I got interested in linking attacks. For simplicity I only look at data in table format, such as xlxx or csv data. To anonymise such data the most common technique is generalization. There are others like synthetic data, changing data, deleting data, etc.. To evaluate the results one can use definitions like k-anonymity, l-diversity or t-closeness.

So fa ...

Score: 1
zezima avatar
installing Kubunto on top of Windows 10 with bitlocker on
it flag

i'm currently running windows 10, and i have bitlocker encryption on some Disks. (not the C: though) and i want to download Kubunto .. (i'm very new to linux environment, never used it before) my question is. do i have to decrypt my encrypted disk before clean install kubunto? or it will be displayed if kept it encrypted? also is there anyway to incrypt my desired Disk the Same way bitlocker work after  ...

Score: 1
Frank Nocke avatar
LibreOffice 7.1 Writer flickers and crashes
in flag

I am using Libreoffice under Ubuntu-MATE 21.04. According to the LO's about dialog: User Interface: UI render: default; VCL: gtk3

I only use the text processing „Writer“, nothing else.

enter image description here

Problem 1: my styles panel (on the right) on the right flickers all the time

...blinks, maybe 50-100ms to white and back... (but certainly not in a blink tag fashion, more of a “nervous redraw”)

  • basically ...
Score: 3
UncleBob avatar
Cannot connect to Amazon RDS with TLSv1.2
in flag

I set up a new machine with Ubuntu 20, and found I wasn't able to connect to my RDS databases anymore.

The spring-boot application that was supposed to connect to the development environment throws the following exception: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)

So I dug out mySql workbench and tried with that. That resulted ...

Score: 0
Y4PQ avatar
Logging in to Ubuntu 20.04
ci flag

I have just upgraded to version 20.04, however, the log-in page is totally messed up. Not clear at all, just weird orange lines all over the screen. Can anyone help to get this situation resolved?

Score: 0
stackprotector avatar
How can I add 'main/dist-upgrader-all' to '/etc/apt/mirror.list' so that my apt-mirror downloads the files for a release upgrade?
be flag

I maintain an apt mirror by using apt-mirror. It works fine for the packages of bionic and focal. Now, I want to add the files, that are needed to be able to perform release upgrades using this mirror. In /etc/apt/mirror.list I added main/dist-upgrader-all to all update sources that contain these folders.

My /etc/apt/mirror.list currently looks like this:

############# config ##################
set base ...
Score: 1
Penny Hughes avatar
I'm trying to create a bootable usb for ubuntu 20.04 on ubuntu 12.04
cn flag

I'm busy following this tutorial:

The installation was working until it asked for permission to install the bootloader

Should I let it install this? My plan is to use this 20.04 USB on a Windows 10 PC without changing windows itself

Thank You for any help

Score: 1
linux_newbie_please_be_kind avatar
Bluetooth Settings Issue After Updating?
ca flag

I've installed Ubuntu 21.04 in a dual boot configuration alongside an existing installation of Windows 10.

Since using it for about one week I've applied all offered official updates and then restarted.

I paired a set of bluetooth headphones in Ubuntu and then ever since a restart the 'Bluetooth Settings' window either does not load or crashes.

Is Ubuntu LTS more stable vs Ubuntu 21.04 for ba ...

Score: 0
Ileana Profeanu avatar
ADFS - Deny authorization to all groups from location
se flag

I want to restrict a domain and all its groups from being authorized by AD FS.

In the server, on AD FS manager, I managed to create a new Access Control Policy group, but I am not sure what to select in "Permit users... except.." so that any user from a specific domain is not authorized by the access control policy.

I can add individual groups, but is there something I could add so all users from t ...

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