L4T FAQs
How do I install Ubuntu Desktop?
The default sample file-system that is provided with the release was created with minimal packages pre-installed. For more information on which packages are present, see the
Setting Up Your File System topic in the
Getting Started chapter.
Please note the possible space constraints with the default partition size specified in the
flash.sh that is referenced in this document. To increase the partition size so that it can accommodate additional packages, see the
Increasing the Internal Memory Partition Size for the Root File System topic in the
Getting Started chapter.
To install the full Ubuntu desktop
2. Execute the following command:
$ sudo apt-get install ubuntu-desktop
Can I install a different X driver Application Binary Interface (ABI)?
Yes. For more information, see the
Setting Up the Root File System topic in the
Getting Started chapter.
How do I disable the Ubuntu firewall which can block NFS root access?
What is the sample rootfs log-in password?
The username is
ubuntu and the password
ubuntu. For more information about the sample file system, see the
Setting Up Your File System topic in the
Getting Started chapter.
How do I prevent the system display from blanking out?
Linux kernel 3.1 (and later) adds a power saving feature that may blank the display of an idle system even when applications are running. The feature is called console blank (screen saver). It is defined as:
consoleblank= [KNL]
Where [KNL] is the console blank (screen saver) timeout in seconds. This defaults to 10*60 = 10 mins. A value of 0 disables the blank timer.
By passing arguments to the kernel command line, you can:
• Disable this feature, or
• Set the timeout to a longer interval.
With the
flash.sh script, you can override the kernel command line options passed from fastboot to the kernel. For more information, see the
Flash Script Usage topic in the
Getting Started chapter.
To disable the console blank (screen saver) from the kernel command line
1. Add the following line to the kernel parameters in the grub configuration:
consoleblank=0
2. View the current consoleblank value with the following command:
$ cat /sys/module/kernel/parameters/consoleblank
To disable the console blank feature with an escape sequence
• Enter the following escape sequence:
$ echo -ne "\033[9;0]"
To change the console blank timeout value with an escape sequence
• Enter the following escape sequence:
$ echo -ne "\033[9;<timeout>]"
where <timeout> is the timeout in seconds.
For more information on this escape sequence, see the console_codes(4) man page documents. For information on the input/output controls that provide some of the same functionality, see the console_ioctl(4) man page.
How do I prevent the file system from becoming read-only on resume if an SD card is in the Card Reader?
If the device resumes from Suspend (LP1) while an SD card is in a connected card reader device, the file system is mounted as read-only resulting in a card reader read/write error and a system reboot is required. The workaround is to install the udisks utility (The usdisks utility has a Debian package name similar to udisks_1.0.2-4ubuntu_armel.deb for the appropriate Ubuntu distro and softfp build. Hardfp packages are often labeled “armhf”).
Can I use an SD card with a card reader already connected to the device?
If the user connects the card reader to the device before inserting the SD card into the card reader, the SD card is not detected. The SD card and card reader must be connected to the device simultaneously. The workaround is to install the udisks utility (The usdisks utility has a Debian package name similar to udisks_1.0.2-4ubuntu_armel.deb Hardfp packages are often labeled “armhf”).
