How to re-enable the systray (indicator panel) on Ubuntu 14.04

Installation in the terminal:

sudo apt-add-repository ppa:fixnix/indicator-systemtray-unity
sudo apt-get update
sudo apt-get install indicator-systemtray-unity

Once installed, you can enable it by this command:

gsettings list-recursively net.launchpad.indicator.systemtray

If you wish to remove it, run this command:

sudo apt-get --purge remove indicator-systemtray-unity

resize2fs: Bad magic number in super-block;

On Centos 7.0, you are trying to resize using “resize2fs2 the new logical volume once you have add a new volume to your group;

this error:

 

[root@centos7 ~]# resize2fs "yourvolumegroup"
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open "yourvolumegroup"
Couldn't find valid filesystem superblock.

On Centos 7.x, its using now XFS (look into the /etc/fstab), default should be xfs.

Instead of using resize2fs, use this command:

xfs_growfs "yourvolumegroup"

HubiC on Raspberry pi

sync your data with HubiC.

Install it on your Raspberry, just download the last package:

http://mir7.ovh.net/ovh-applications/hubic/hubiC-Linux/1.2.5/

Install it:

sudo dpkg -i -R hubiC-Linux-1.2.5.38-linux.deb

finalize the installation as for the dependancies:

sudo apt-get -f install

Before running it, you need to reed the bus:

dbus-launch --sh-syntax

Copy/paste the bus data address and export the settings (change ‘xxxx’ with your own data from the previous command output:

export DBUS_SESSION_BUS_ADDRESS='unix:abstract=/tmp/dbus-xxxx,guid=xxxx'

And run hubiC with the login you have created on the website:

mkdir /home/pi/hubiC
hubic login login@domain.tld /home/pi/hubiC

 

Sendmail is only accepting connections from localhost

By default configured to accept connection from local system (127.0.0.1). This should avoid open mail relay problem.

To allow connections from ALL hosts/LAN IPs open sendmail.mc file (login as the root):

# vi /etc/mail/sendmail.mc

Look for line that read as follows:

DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl

Comment or remove above line and insert new line that read as follows:

DAEMON_OPTIONS(`Port=smtp,Name=MTA')dnl

Above line will force to accept connection from any host. Save the file. Regenerate sendmail configuration file using m4:

# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

If this command is resulting by giving such of error as below, this means that the file

/etc/mail/sendmail.mc:10: m4: cannot open `/usr/share/sendmail-cf/m4/cf.m4': No such file or directory

Then, this means that the sendmail.cf.xx rpm package is missing and require to be installed.

In my case, I had to mount the cdrom, and look for this rpm file:

sendmail-cf-8.13.8-2.el5.i386.rpm

Restart sendmail service :

# /etc/init.d/sendmail restart