Translations by Martin Šácha

Switch <gui>High Contrast</gui> to <gui>ON</gui>.

Switch <gui>Large Text</gui> to <gui>ON</gui>.

The Unity desktop includes assistive technologies to support users with various impairments and special needs, and to interact with common assistive devices. Many accessibility features can be accessed from the <gui>Universal Access</gui> section of <gui>System Settings</gui>.

The GNOME desktop includes assistive technologies to support users with various impairments and special needs, and to interact with common assistive devices. Many accessibility features can be accessed from the accessibility menu in the top bar.

Some special pointers, such as the resize pointers, do not change colors. You can still use simulated secondary click as normal, even if you don't get visual feedback from the pointer.

If you use <link xref="mouse-mousekeys">Mouse Keys</link>, this also allows you to right-click by holding down the <key>5</key> key on your keypad.

Add an account

For security reasons, Ubuntu will not store your password on your computer. Instead, it stores a token that is provided by the online service. If you want to fully revoke the link between your desktop and the online service, <link xref="accounts-remove">remove</link> it.

Andre Klapper

Why add your email or social media accounts to your desktop?

Bluetooth is a wireless protocol that allows you to connect many different types of devices to your computer. Bluetooth is commonly used for headsets and input devices like mice and keyboards. You can also use Bluetooth to <link xref="bluetooth-send-file">send files between devices</link>, such as from your computer to your cell phone.

Make the other Bluetooth device <link xref="bluetooth-visibility">discoverable or visible</link> and place it within 10 meters (about 33 feet) of your computer. Click <gui>Continue</gui>. Your computer will begin searching for devices.

If there are too many devices listed, use the <gui>Device type</gui> drop-down to display only a single type of device in the list.

Click <gui>PIN options</gui> to set how a PIN will be delivered to the other device.

Choose an appropriate PIN setting for your device, then click <gui>Close</gui>.

Click <gui>Continue</gui> to proceed. If you did not choose a preset PIN, the PIN will be displayed on the screen.

If required, confirm the PIN on your other device. The device should show you the PIN you see on your computer screen, or may prompt you to enter the PIN. Confirm the PIN on the device, then click <gui>Matches</gui>.

You need to finish your entry within about 20 seconds on most devices, or the connection will not be completed. If that happens, return to the device list and start again.

A message appears when the connection successfully completes. Click <gui>Close</gui>.

There are a number of reasons why you may not be able to connect to a Bluetooth device, such as a phone or headset.

Some Bluetooth devices block connections by default, or require you to change a setting to allow connections to be made. Make sure that your device is set up to allow connections.

Your Bluetooth adapter/dongle may not have been recognized by the computer. This could be because <link xref="hardware-driver">drivers</link> for the adapter aren't installed. Some Bluetooth adapters aren't supported on Linux, so you may not be able to get the right drivers for them. In this case, you will probably have to get a different Bluetooth adapter.

Make sure that your Bluetooth adapter is switched on. Click the Bluetooth icon in the <gui>menu bar</gui> and check that it's not <link xref="bluetooth-turn-on-off">disabled</link>.

Check that Bluetooth is turned on on the device you're trying to connect to. For example, if you're trying to connect to a phone, make sure that it's not in airplane mode.

If you don't want to be connected to a Bluetooth device anymore, you can remove the connection. This is useful if you no longer want to use a device like a mouse or headset, or if you no longer wish to transfer files to or from a device.

Select the device you want to disconnect in the left pane, then click the <gui>-</gui> icon underneath the list.

Click <gui>Remove</gui> in the confirmation window.

Share files to Bluetooth devices such as your phone.

Send a file to a Bluetooth device

You can send files to connected Bluetooth devices, such as some mobile phones or other computers. Some types of devices don't allow the transfer of files, or specific types of files. You can send files in one of three ways: using the Bluetooth icon in the menu bar, from the Bluetooth settings window, or directly from the file manager.

Click the Bluetooth icon in the menu bar and select <gui>Send Files to Device</gui>.

The list of devices will show both <link xref="bluetooth-connect-device">devices you are already connected to</link> as well as <link xref="bluetooth-visibility">visible devices</link> within range. If you have not already connected to the selected device, you will be prompted to pair with the device after clicking <gui>Send</gui>. This will probably require confirmation on the other device.

If there are many devices, you can limit the list to only specific device types using the <gui>Device type</gui> drop-down.

Send files from the Bluetooth settings

Click the Bluetooth icon in the menu bar and select <gui>Bluetooth Settings</gui>.

Select the device to send files to from the list on the left. The list only shows devices you've already connected to. See <link xref="bluetooth-connect-device"/>.

In the device information on the right, click <gui>Send Files</gui>.

You can turn Bluetooth on to use Bluetooth devices and send and receive files, but turn it off to conserve power. To turn Bluetooth on, click the Bluetooth icon on the top bar and switch <gui>Bluetooth</gui> on.

Many laptop computers have a hardware switch or key combination to turn Bluetooth on and off. If the Bluetooth hardware is turned off, you will not see a Bluetooth icon in the menu bar. Look for a switch on your computer or a key on your keyboard. The keyboard key is often accessed with the help of the <key>Fn</key> key.

Whether or not other devices can discover your computer.

What is Bluetooth visibility?

Bluetooth visibility simply refers to whether other devices can discover your computer when searching for Bluetooth devices. When Bluetooth visibility is turned on, your computer will advertise itself to all other devices within range, allowing them to attempt to connect to you.

Your computer does not need to be visible to search for other devices, but those devices need to be visible for your computer to discover them.

After you have <link xref="bluetooth-connect-device">connected to a device</link>, neither your computer nor the device needs to be visible to communicate with each other.

Unless you or someone you trust needs to connect to your computer from another device, you should leave visibility off.

You will need to crop the TIFF file so that just the target is visible. Ensure the white or black borders are still visible. Calibration will not work if the image is upside-down or is distorted by a large amount.

You scan in your target file and save it as an uncompressed TIFF file. You can then click <gui>Calibrate…</gui> from <guiseq><gui>System Settings</gui><gui>Color</gui></guiseq> to create a profile for the device.

Alternatively you can select <gui>Import profile…</gui> from <guiseq><gui>System Settings</gui><gui>Color</gui></guiseq> when selecting a profile for a device.

ProPhoto is the largest space available and is frequently used for document archival. It can encode nearly the whole range of colors detected by the human eye, and even encode colors that the eye cannot detect!