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-1

Count down to Line 57 of the /etc/apt/sources.list file, and just delete it from the file. In order to modify the file, remember you'll need to open it as root with the following command: gksudo gedit /etc/apt/sources.list After bringing this file back to normal, run: sudo apt-get update


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Came across this issue as well on 15.04. Same symptoms and errors as OP but killing/re-starting the nm-applet wouldn't fix anything. The solution for me was to edit the configuration file for my network interface located at /etc/NetworkManager/system-connections/Wired\ connection\ 1 I added the relevant parts of my 802.1x settings in the file and it ...


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Why the entries have been removed, there can only be speculated. Maybe there are new keys for you, maybe the server did get a new key. Maybe your account has been disabled intentionally. Or a program/script has deleted these entries. The entry in known_hosts will be recreated. Open a new connection and you will be asked. If you don't have a private key, ...


4

To show all files created on 16/05/2015: sudo find / -type f -newermt 2015-05-16 Now to see attributes such as owner, modification date, permissions easily use ls -l command: sudo find / -type f -newermt 2015-05-16 | xargs ls -l Thanks to muru note: same result can be achieved with: sudo find / -type f -newermt 2015-05-16 -ls Read this for more ...


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You can Block IP Address in Ubuntu using iptables I have created a DEMO video to how to block/unblock a Source IP address Block/Ublock IP Address in Ubuntu Using iptables


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Tracker is a search engine, search tool and metadata storage system. It allows you to find the proverbial needle in your computer's haystack as well as providing a one stop solution to the organisation, storage and categorisation of your data. Source and more Infos, thx @solsTiCe for the hint tracker can consume a lot of resources Install iotop, a simple ...


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You have to connect to Internet to install it, unless you know how to install a package from offline repository! So I suppose you have to connect to Internet and take it easy and don't be paranoid. You can install Tripwire easily using: sudo apt-get install tripwire This should resolve any dependency problems


2

It is perfectly normal for software to create files and their own directory in /tmp/ to store temporary files (most likely these are session related files). That is what /tmp/ is for. In general these files contain the name of the software (like your example with owncloud* and a "random" set of characters behind it). If you never installed owncloud and you ...


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I opened a terminal window (Control-Alt-T) then typed ControlPanel and pressed Enter. Just a few moments later the Java Control Panel appeared. I haven't checked yet, but it may be necessary to 'sudo ControlPanel' to save your changes.


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If you have a master password, then Firefox will need you to input that password in order to use any of your stored passwords. There is no way around this, because the stored passwords are actually encrypted using a key derived from the master password. So it is not possible to have a master password, but set Firefox only to ask for it if you want to ...


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"security. ask_for_password" Determines when Mozilla should ask for the master password. 0 (default): Only the first time it's needed.(As per your need set this value) 1: Every time it's needed 2: Every n minutes, where n is the value in security.password_lifetime. My personal suggestion. Before leaving the system to some one. Press ...


5

Even in Debian, there are many many packages that don't get regular security updates. From the Debian security channel on OFTC IRC: The security team provides support for all packages, with the help of the package maintainers (and upstream developers). From the general discussion, we can assume that major security breakages get their attention, but ...


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If your computer has never had an Android device connected, then I don't know where those files came from. On my computer (as I use both Android and its SDK) those files are an SSH key-pair that allow me to mark my computer as "trusted" to my phone. SSH keys shouldn't be harmful. If you want to verify that these are SSH keys, open ".android" in the file ...


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Please note, you can set any password using root account, there rules accepted for users that trying to change it's own password. To set password expiration and other parameters for all new users you should check /etc/login.defs file. Actually your rules looks like correct, I think you just try to set password using root, but superuser (root) should have ...


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TL;DR: Do things as root only when you have to. sudo makes this pretty easy. If you enable root logins, you can still follow this rule, you just have to be careful to do so. Although enabling root logins is not actually insecure if done right, you don't need to enable root logins because you have sudo. There are really two related questions here. Why is ...


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You can Enhance your security by enable roundcube section Roundcube does have captcha plugins available which will mitigate this, but users will complain if they have to type in a captcha to login for mail. Fail2ban provides an easy solution for this. First up, we need to add roundcube into /etc/fail2ban/jail.conf [roundcube] enabled = false port = ...


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According to what brought in How Effective is ASLR on Linux Systems? programs must be compiled as Position Independent Executables (PIE) to gain ASLR benifits. For gcc compiler -fPIE switch should be used to compile programs which use ASLR: gcc -fPIE -o ./test.o test.c^


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Maybe this will help you: Privacy in Ubuntu 12.10: Full Disk Encryption


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If someone searches for more details: I solved my problem with the fingerprints of the keyfiles (you can get them with apt-key finger) and compared them with other (secure) systems. Maybe helpful is this thread: How do I know my system updates are trustworthy?


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The validity of the packages is checked against a keyring which can be explicitly specified with the --keyring=KEYRING option of debootstrap (see man debootstrap for details). If omitted debootstrap uses system keyrings which you can easily install with [name]-keyring packages in synaptic/apt-get and (only slightly more complicated) from source. If ...



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