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apt: Signature by Key Uses Weak Digest Algorithm SHA1 Error

In the world of Linux systems, running into warnings and errors is not uncommon.

The following message is one such warning that can cause concern:

apt: Signature by Key Uses Weak Digest Algorithm (SHA1)

Today, we are going to take a look at this issue and how to solve it.

The SHA1, or Secure Hash Algorithm 1, is a popular cryptographic hash function producing a 160-bit hash value. Unfortunately, it is vulnerable, prompting a move towards more robust algorithms like SHA256.

Fix 1: Upgrade to the Newer apt Command

First, we can try switching from using apt-get to apt. The apt command offers a more user-friendly approach while handling packages on Linux systems.

We can update our package list with apt, as seen here:

sudo apt update

The sudo command will run the command with root privileges. On the other hand, apt is the package handling utility. Furthermore, the update command updates the package list.

Additionally, we can upgrade packages with this command and fix the error:

sudo apt upgrade

Fix 2: Check for Package Upgrades

Next, we can try checking for package upgrades. Once we run the sudo apt update command, we can run the sudo apt upgrade command to check if there are any package upgrades available.

Alternatively, we can use this command to see a list of packages to be upgraded:

apt list –upgradeable

Fix 3: Remove the Problematic Repository

In case the error is due to a certain repository, we can remove it. Our experts recommend this fix as the last resort as it prevents any software from that repository from getting new updates, as well as important security updates.

Here is the command to remove a repository:

sudo add-apt-repository --remove ppa:PPA_NAME/ppa

We have to replace PPA_NAME with the name of the repository causing the problem.

Let us know in the comments if you need further help with this error.

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Conclusion

At the end of the day, our Support Experts demonstrated how to fix “apt: Signature by Key Uses Weak Digest Algorithm SHA1 Error “.