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1500 questions
105
votes
3 answers
What is apparmor?
I hear a lot of talk about apparmor, I want to know the following:
What is apparmor?
How does apparmor work?
Alvar
- 17,038
105
votes
8 answers
Can I run Android apps on Ubuntu?
Is it possible to run Android apps on Ubuntu? And I don't mean inside an emulator, but natively, as you would with any other application installed using the Ubuntu Software Center.
mxhernaiz
- 1,419
105
votes
7 answers
How can you unhold (remove a hold on) a package?
I used synaptic to lock the version of pidgin-data - how can I change the status from hold back to normal, so that it gets upgraded properly?
The PinningHowto says that doing an apt-get install packagename should remove the hold, but running dpkg -l…
David Fraser
- 1,787
105
votes
4 answers
How can I tell what version of Java I have installed?
I want to start toying around with java (eventually getting to the point where I can write basic little programs for android or web), but I've managed to have java messed up on my computer (from past experiments).
I'm not sure which version of java…
Stramato
- 1,477
105
votes
4 answers
What are the pros and cons of having a separate home partition?
This is not a question about how to create a home partition, just as a caveat. :)
What are the pros and cons to having a separate home partition? How do I know if having one is right for me? Will it increase or decrease speed of file retrieval? Are…
Ryan McClure
- 6,119
105
votes
8 answers
The following signatures were invalid: EXPKEYSIG 1397BC53640DB551
This is Issue 952287: [User Feedback - Stable] Reports of Chrome for Linux failing to install/update due to expired GPG signing key
Today, running apt in all my machines gives this error with the Google PPA (for google-chrome):
me@mymachine:~$ sudo…
Leo
- 3,644
104
votes
17 answers
104
votes
11 answers
"physical block size is 2048 bytes, but Linux says it is 512" when formatting USB - How to create a bootable USB without this error
I was using:
dd if=/path/to/my/ubuntuiso/ubuntu.iso of=/dev/sdb1 bs=4M && sync
In order to create bootable Ubuntu USB drives on older Ubuntu versions. It was working perfectly. Sometimes I used the Startup Disk Creator program, which worked…
Severus Tux
- 10,126
104
votes
5 answers
Why do I get "Required key not available" when install 3rd party kernel modules or after a kernel upgrade?
This issue happens only on UEFI systems with enabled Secure Boot.
When I try to install DKMS modules like VirtualBox, Nvidia, or Broadcom drivers, they do not install and I get Required key not available when I try to modprobe them.
VirtualBox…
Pilot6
- 92,041
104
votes
9 answers
Problem with installing Steam on Ubuntu 15.04+
Actually I have installed the new Ubuntu 15.04 64bit, and when I'm trying to install Steam on it, there is a problem.
In fact I have downloaded the deb package from steam website, installed it and when I start it nothing happens.
I tried to start it…
saber hammami
- 1,049
104
votes
7 answers
List of Ubuntu Versions with Corresponding Linux Kernel Version
Is there a list of Ubuntu versions with default corresponding Linux kernel versions somewhere?
I would specifically like to know the most recent version of Ubuntu that still used Linux Kernel 2.x.
Jonathan Mee
- 1,143
104
votes
6 answers
How to avoid being prompted for a password by sudo?
I know I can become root (super user) via the su command but I have to authorize it after entering the commands. Is there a way I can become root and authorize (with password) in one line
Vader
- 1,462
104
votes
8 answers
Nginx failing to reload - how to track down why?
Hi I've had my Nginx server running great on Ubuntu server 12.04 for a while.
I've been gradually bolting on various bits, and got as far as optimising load times on my wordpress page.
After making a few changes to my hosts file I decided to:
sudo…
Huw
- 1,603
- 3
- 17
- 23
104
votes
8 answers
Computer freezing on almost full RAM, possibly disk cache problem
The problem I think is somewhat similar to this thread.
It doesn't matter if I have swap enabled or disabled, whenever the real used RAM amount starts going close to maximum and there is almost no space left for disk cache, system becomes totally…
Krišjānis Nesenbergs
- 2,011
104
votes
2 answers
Delete whole line in nano editor
some times while I am editing my files with nano I am facing difficulty while deleting some big line, I need to hold Del key for long time.
is there any shortcut I can found to delete the total line at a time ?
I have checked the man-page , still no…
Raja G
- 105,327
- 107
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- 331