Kali Linux

All posts tagged Kali Linux

Solving apt-get update error on kali linux

Posted by Kulani Mahadewa on February 23, 2019
Posted in: Kali Linux, Linux. Tagged: , , . Leave a comment

Hi! I got following “invalid signature error” on kali linux when trying to update using apt-get update command. Below I list down the working solution for me among various solutions on forums.

Error:

W: GPG error: https://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.6 Release: The following signatures were invalid: EXPKEYSIG 58712A2291FA4AD5 MongoDB 3.6 Release Signing Key <packaging@mongodb.com>
E: The repository 'https://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.6 Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Solution:

Use following sequence of commands.

  • sudo rm -rf /var/lib/apt/lists
  • sudo mkdir -p /var/lib/apt/lists/partial
  • sudo apt-get clean
  • sudo apt-get update

“invalid: EXPKEYSIG 58712A2291FA4AD5 MongoDB 3.6 Release Sign” from the error message above.

  • sudo apt-key adv --recv-keys --keyserver keys.gnupg.net 91FA4AD5
  • apt-get update

Console output:

screenshot-from-2019-02-23-14-28-19-e1550904016798.png

Cheers! 🙂

Make error “could not find jdk tools.jar”

Posted by Kulani Mahadewa on February 21, 2019
Posted in: Build Issues, Kali Linux, Linux. Tagged: , , , , , . Leave a comment

Hi! Here is a  solution for the “could not find jdk tools.jar” while executing “make” command to build android source code, caused by wrong java version used on PC.

Error:

build/core/config.mk:601: *** Error: could not find jdk tools.jar at /usr/lib/jvm/java-11-openjdk-amd64/bin/../lib/tools.jar, please check if your JDK was installed correctly.  Stop.

Cause: tools.jar is not available in latest openjdk versions (after openjdk-9). I had openjdk-11 on my machine.

Solution:

Step 1:  Install Openjdk-8 or 9

sudo apt-get install openjdk-8-jdk

Install OpenJDK-9

tar -xzf '/home/OpenJDK/openjdk-9_linux-x64_bin.tar.gz'

Screenshot from 2019-02-22 21-32-59

  • Use following commands
cd jdk-9
update-alternatives --install /usr/bin/java java /home/OpenJDK/jdk-9/bin/java 100

Screenshot from 2019-02-22 21-38-35

Step 2: Set Openjdk-8 as default java version.

sudo update-alternatives --display java
sudo update-alternatives --config java
java -version

Screenshot from 2019-02-21 13-16-18

Cheers !