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Questions tagged [security]

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Security covers a wide-ranging set of topics including Users, Permissions, Authentication, Authorisation, Upgrades, Firewalling, Hardening, etc.

434 questions
Newest Active Bountied Unanswered
348 votes
9 answers
183k views

I see a lot of interesting programs out there that can only be obtained by adding a "PPA" to the system but, if I'm understanding correctly, we should stay within the official "repositories" for ...
Rob's user avatar
  • 13k
110 votes
7 answers
62k views

I've been using gksudo nautilus and sudo nautilus through Alt+F2. What's the difference? They look very similar!
DrKenobi's user avatar
  • 6,582
226 votes
22 answers
179k views

I've often come across posts on forums or other websites where you see people joking in such a manner about running/logging in as root as if it's something awful and everyone ought to know about it. ...
Mussnoon's user avatar
  • 5,236
30 votes
7 answers
36k views

Today a couple of buffer overflows in NTP were announced 1, 2. It looks like updating my system to fix these issues is in order. How can I find out if they have been fixed in the Ubuntu repositories,...
Jxtps's user avatar
  • 411
245 votes
11 answers
227k views

Is there a way to make sure that a deleted file can not be recovered? As you know, deleting a file by pressing shift-del or using trash doesn't mean that file is gone forever. It resides somewhere ...
user avatar
81 votes
3 answers
29k views

Any questions relating to status updates, or asking if anything is going to be patched for these vulnerabilities should be closed as duplicates of this question. Meltdown and Spectre are in the news ...
Robie Basak's user avatar
  • 16k
19 votes
7 answers
44k views

What antivirus programs are available for Ubuntu? We previously used Symantec Endpoint Protection but it does not work in Ubuntu.
Deepak Rajput's user avatar
  • 7,147
228 votes
2 answers
616k views

I installed ClamAV via Terminal (Ctrl+Alt+T) with: sudo apt-get install clamav but how can I scan for viruses?
BuZZ-dEE's user avatar
  • 14.7k
135 votes
13 answers
158k views

What measures can/should I take to make sure that security around my SSH server is absolutely impermeable? This will be community wiki from the start, so lets see what people do to secure their ...
Community wiki
2 revs, 2 users 80%
LassePoulsen
43 votes
14 answers
33k views

Why does Ubuntu not allow the GUI users to login as root at the time of system start up like administrator in Windows? Why they are restricting us to login only through the terminal?
Renjith G's user avatar
  • 3,613
100 votes
8 answers
184k views

Let's say that I have a folder, within my Documents folder, that has files I want no one to access without a password. Is there a way to lock down that folder so that it's password protected / ...
Gonzoza's user avatar
  • 2,538
80 votes
2 answers
69k views

When developing a page on a localhost, I sometimes get a "Permission denied" error which I can solve by running chmod -R 777 /var/www. However, people are telling me that this is a bad idea for ...
Luis Alvarado's user avatar
  • 218k
413 votes
10 answers
486k views

sudo apt-get upgrade installs all updates, not just security updates. I know that I can use Update Manager to select only important security updates, but is there a way to do this from the command ...
crenshaw-dev's user avatar
  • 33.1k
73 votes
7 answers
15k views

I messed up my system earlier, I was greeted with a black screen, when booting in to Ubuntu. When I started up my laptop, I selected the recovery option from the grub menu, and chose fallback at root ...
blade19899's user avatar
  • 27k
24 votes
5 answers
15k views

Can wine as a whole or the windows applications installed via wine pose some kind of risk to an Ubuntu installation? This question arose in my mind when I read this answer to my earlier question ...
Chethan S.'s user avatar
  • 2,874

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