Unmet dependencies errors updating kubuntu 18

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Hello,

I made silly error of installing Opera 386 version in my kubuntu 18.04(64bit) and next I got errors:

$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 opera-stable:i386 : PreDepends: apt-transport-https:i386
                     Recommends: pepperflashplugin-nonfree:i386 but it is not installable
                     Recommends: chromium-codecs-ffmpeg-extra:i386 but it is not installed
 slimjet : Depends: libcurl3 but it is not installed or
                    libcurl4 but it is not installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

I tried to remove this package by :

# sudo apt-get remove  opera-stable:i386
Reading package lists... Done                                                                                                                                                                                                                
Building dependency tree                                                                                                                                                                                                                     
Reading state information... Done                                                                                                                                                                                                            
You might want to run 'apt --fix-broken install' to correct these.                                                                                                                                                                           
The following packages have unmet dependencies:                                                                                                                                                                                              
 slimjet : Depends: libcurl3 but it is not going to be installed or                                                                                                                                                                          
                    libcurl4 but it is not going to be installed                                                                                                                                                                             
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

I am not sure if
apt --fix-broken install
is a safe way to fix it… How to fix these errors correctly ?



$ lsb_release -d; uname -r; uname -i
Description:    Ubuntu 18.04.3 LTS
4.15.0-58-generic
x86_64

Thanks!