To check what connections to ports are open on your computer:
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:(("sshd",pid=445,fd=3))
LISTEN 0 100 0.0.0.0:25 0.0.0.0:* users:(("master",pid=929,fd=13))
LISTEN 0 128 *:3306 *:* users:(("mysqld",pid=534,fd=30))
LISTEN 0 128 *:80 *:* users:(("apache2",pid=765,fd=4),("apache2",pid=764,fd=4),("apache2",pid=515,fd=4))
LISTEN 0 128 [::]:22 [::]:* users:(("sshd",pid=445,fd=4))
LISTEN 0 100 [::]:25 [::]:* users:(("master",pid=929,fd=14))
LISTEN 0 70 *:33060 *:* users:(("mysqld",pid=534,fd=33))
When I start a scala console and type after the prompt, nothing is visible. This fixes the issue temporarily:
This is a known issue for Ubuntu 18.04 and Scala 2.11 (see stackoverflow).
When I open a ssh session in the terminal, it asks for my passphrase in a graphical prompt window. That would be ok in theory. But I don’t know my passphrase. So I need to copy it from my password manager. And unfortunately the stupid window doesn’t allow me to access anything else. So, I wanted to disable it.
The usual way is with the environment variable
SSH_ASKPASS. To disable the graphical prompt, just remove the value of this variable:
Unfortunately, in my case this did not work and I needed to remove also another variable:
I just spent a lot of time searching, so I really need to make sure not to forget this. I want to see a colleague’s calendar. Everything is in Office 365, so I have no problem adding the calendar in the web interface. Naive me thought, this will cause Evolution Mail to show the calendar also. Nope.
I searched for a way to add a calendar in the calendar view of Evolution. With right click on the account or in some menu. Nope. I can add calendars for myself, but not get a colleague’s calendar. Of course. That would have been too easy!
So what does work? Thank you jldugger:
On the Mail view, right click your exchange account, select “Subscribe to folder of other EWS user.” Type in the name of the account you want, and choose “Calendar” from the dropdown.
For me “Free/Busy as Calendar” worked, “Calendar” did not.
First, you will need to install
sudo apt install iFuse
Then, it is really simple:
1. Connect your iPhone with USB to your laptop.
2. Unlock your iPhone.
3. The phone will ask if you want to trust this computer, say yes.
3. Open the folder Dolphin/file browser. For me, I get a “open camera” notification that leads me to the picture folder in the file browser. You can also try
camera://<id given by idevicepair> or
afc://<id given by idevicepair>.
4. Copy the files!
When I did this, I had to reset the connection with
idevicepair a few times, but other than that it worked very well.
If this does not work for you, try this very thorough guide by Dedoimedo/Igor Ljubuncic: How to access iPhone (6s) with iOS 11 in Linux
Someone thought it a good idea to remove the settings dialogue in Nautilus. Whatever. Here is how to set “list view” as default and enable tree view:
gsettings set org.gnome.nautilus.preferences default-folder-viewer 'list-view'
gsettings set org.gnome.nautilus.list-view use-tree-view true
Changing your password for an already-encrypted hard-drive:
sudo cryptsetup luksChangeKey /dev/sdaX
(where X is the number of the drive you want to change)
Did you know, that you can be connected to the internet with a cable and still be in the wrong subnet? That’s what happened to me. I plugged in the cable and the internet worked. Or so I thought. Then I needed to download a file from a company internal location and the server was unreachable. But for my colleague it worked without problems. Mhm. Typo? My colleague sent me a link – no luck. DNS? I tried the IP directly – no luck. Restart? Advice from IT – but no luck.
After involving two more colleagues, we figured it out: There is a thing called 802.1x Security Authentication. Basically, after connecting to the internet, you still need to enter your user credentials to be allowed into the internal parts of the network. In my company’s case, they use PEAP. Apparently, Windows and Mac usually ask for the authentication automatically when connecting to a network that offers this method. Hence the advice by IT to restart. Well, Linux doesn’t ask. You need to know how to answer! When you know it, it’s easy: In Gnome activate the method under “Network Settings” – “Security”. You may need a certificate – ask your admins!
I learned something new today.
I use Linux in a corporate environment where Microsoft Office 365 is the toolchain of choice. One of the first things I needed to do my job was Microsoft Teams. Here are two things that worked for me.
The first (obvious) idea is to use the web UI. Messaging works out of the box with Chromium or Google Chrome. Getting audio and video calls to work is not obvious anymore. Basically, you need to pretend that you are on a Windows machine. This can be done by setting the “User Agent” to “Edge – Windows” with in the developer tools – see Christian Hujer’s blog post on the topic. Unfortunately, this hack breaks the message history. And there seems to be no way to get screen sharing to work. So while this solution is very easy, it is not optimal.
The second thing I tried and which works fine for me, is the unofficial MS Teams client by Ismael Martinez. I have it running on Ubuntu 18.04. As far as I have seen, everything works. Thank you!
If you want to give away a computer and you want to really delete the data on the hard drive, you can use
dd under Linux. Start a live linux from a USB drive (for example Ubuntu) on the computer where you want to erase the disk.
First, find out which partitions you have. A basic way of doing this is by using
sudo fdisk -l
Most distributions will have a graphical editor which makes it easier to see what is going on. In gnome this will be
gparted, in KDE
KDE partition manager. There are surely other tools around. But it does not really matter, all you need is to know the name of the partition which you want to erase. In my case it is
Now we will use
dd (“disk dump”) to write random information to this partition on top of the existing information. This is the command:
sudo dd if=/dev/urandom of=/dev/sda4 bs=65536 status=progress
of (“output file”) is the hard disk partition we want to write to. You do not want to mess up and take the wrong partition. The is no “undo”. Check this parameter twenty times. The parameter
if (“input file”) is used to set the data which should be written. In our case, we use
/dev/urandom which is a generator for random numbers.
status=progress will enable some output on the command line which tells us what is happening. If you forget this parameter, there will be no output and you will have no idea if 1 byte has been written in the last hour or 200 GB. Setting the block size (
bs) to something larger than the default 512 bytes is also very highly recommended. The difference in the time the command needs to run may be huge. I use 64k in the example which worked fine for me. If you want to determine the optimal block size for your system, I suggest this article: Tuning dd block size by Danny Guinther.