Install Updates Error

[Şerban S.]

E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 3781 (apt-get)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

Hi!
The message explains exactely what went wrong:
Either you were using GDebi to install something BEFORE triggering the Update sequence, OR,
You were using Synaptic Package Manager, OR,
You were using apt-get itself, for whatever installation of something.
Since the update process IS EXCLUSIVE (as explained in the post before).
Now, each time you trigger the "Update Software" process, remember to check if any instance of the processes listed above is ACTIVE, and if so, CANCEL the Update and finish the job at hand. After that, you can use the Update sequence.
Although I am using Linux on a daily basis for more than 10 years, it sometimes happens to me (with Synaptic PM) so "I've been there", as we say...
I recognized the error message.

I hope you'll get to the end of the Update with this!
IF this solves the issue, please, remember to mark the thread as SOLVED
All the best!