Upgrading problem

I have received no updates for several weeks on Ubuntu Mate 18.04, this is unusual.

It is possible something error in my /etc/apt/sources.list, how to restore all to default settings?

How are you upgrading? If just waiting for "Software Updater" there can be some time.
Otherwise open a terminal and type

sudo apt-get update

and then

sudo apt-get upgrade

to upgrade the whole system

sudo apt-get dist-upgrade

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no work for me, my kernel is Linux 5.3.0-42-generic, is the newest?

My system is running
Ubuntu, with Linux 4.15.0-91-generic
I do not upgrade my kernel except when Ubuntu Mate upgrades it.

apt-get upgrade VS apt-get dist-upgrade
Which would be better?
The patches from later command is not recommended by Ubuntu Mate?!

Many warnnings when apt update, just like

W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:4 and /etc/apt/sources.list:13

You have most than one config in file /etc/apt/sources.list

Proceed backup /etc/apt/sources.list:
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

Copy file to your personal folder (directory) and enter inside:
cp /etc/apt/sources.list ~/ ; cd ~

Remove duplicate lines (can use 'awk'):
awk '!x[$0]++' sources.list > sources-revised.list

Look in if all is fine:
more sources-revised.list

Copy file to /etc/apt/:
sudo cp sources-revised.list /etc/apt/sources.list

Try to update system:
sudo apt-get update

Cheers!

Generally do apt-get upgrade. If you do upgrade and it tells you "packages have been held back' and then lists a new kernel, you then do apt-get dist-upgrade to get the newer kernel.

Someone says the risk with apt-get dist-upgrade is this may lead to the removal of some packages.
So whats risks on security?

This is an excellent description of upgrade vs dist-upgrade

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