Solved.

sudo apt-get install opera-stable
sudo apt --purge remove opera-stable

Actually I am trying to delete Opera browser, apt says not found but it exists and can run it.

sudo apt remove opera
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package 'opera' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.

sudo apt remove opera-stable
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package 'opera-stable' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.

I tried

wget -qO - http://deb.opera.com/archive.key | sudo apt-key add -
gpg: invalid key resource URL '/tmp/apt-key-gpghome.vdPLLzFvm1/home:manuelschneid3r.asc.gpg'
gpg: keyblock resource '(null)': General error
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key 7721F63BD38B4796: 2 signatures not checked due to missing keys
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: Total number processed: 10
gpg:       skipped new keys: 10

I have error

GPG error: https://deb.opera.com/opera-stable stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DD3C368A8DE1B7A0

Here is an output

sudo apt-get update --fix-missing
Hit:1 http://ru.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://ru.archive.ubuntu.com/ubuntu focal-updates InRelease                                                      
Hit:3 http://ru.archive.ubuntu.com/ubuntu focal-backports InRelease                                                    
Hit:4 http://ppa.launchpad.net/agornostal/ulauncher/ubuntu focal InRelease                                             
Hit:5 https://dl.google.com/linux/chrome/deb stable InRelease                                                          
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease                                                       
Get:7 https://deb.opera.com/opera-stable stable InRelease [2 590 B]                                                    
Hit:8 http://ppa.launchpad.net/ansible/ansible/ubuntu focal InRelease                                                  
Hit:9 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease                                           
Err:7 https://deb.opera.com/opera-stable stable InRelease                       
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DD3C368A8DE1B7A0
Hit:10 http://download.opensuse.org/repositories/home:/manuelschneid3r/xUbuntu_21.10  InRelease
Reading package lists... Done                             
W: GPG error: https://deb.opera.com/opera-stable stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DD3C368A8DE1B7A0
E: The repository 'https://deb.opera.com/opera-stable stable InRelease' 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.

Please advice