How to fix dependencies?

Question

mint

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Pandora ~ # apt-get update
Ex:1 ppa.launchpad.net/deluge-team/ppa/ubuntu xenial InRelease
Sex:2 security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Ex:3 archive .canonical.com/ubuntu xenial InRelease
Ex:4 archive.ubuntu.com/ubuntu xenial InRelease
Ex:5 ppa.launchpad.net/embrosyn/cinnamon/ubuntu xenial InRelease
Ex:6dl.google.com/linux/chrome-remote-desktop/deb stable InRelease
Ign:7 packages.linuxmint.com serena InRelease
Ex:8 archive.ubuntu.com/ubuntu xenial-updates InRelease
Ign:9 dl.google.com/ linux/chrome/debstable InRelease
Ex:10 ppa.launchpad.net/flexiondotorg/youtube-dl-gui/ubuntu xenial InRelease
Sex:11 archive.ubuntu.com/ubuntu xenial-backports
InRelease [102 kB]
Ex:12 dl.google.com/linux /chrome-remote-desktop/deb stable Release
Ex:13ppa.launchpad.net/notepadqq-team/notepadqq/ubuntu xenial InRelease
Ex:14 packages.linuxmint.com serena Release
Ex:15 dl.google.com/linux/chrome/deb stable Release
Ex:17 ppa.launchpad.net/ teejee2008/ppa/ubuntu xenial InRelease
Ign:20https://mega.nz/linux/MEGAsync/xUbuntu_16.04 ./ InRelease
Sex:21 https://mega.nz/linux/MEGAsync/xUbuntu_16.04 ./ Release [988 B]
Got 205 kB in 3s (61 .7 kB/s)
Reading package lists... Done
Pandora ~ # apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading status info... Done
Calculating upgrades... Done
0 upgraded, 0 new packages installed, 0 marked to be removed, and 0 packages are not updated.
Pandora ~ # apt-get install sqlitebrowser
Reading package lists… Done
Building dependency tree
Reading status information... Done
Some packages cannot be installed. Perhaps you are asking for
the impossible, or you are using an unstable version of the distribution where the packages you requested have not yet been built or have been removed from Incoming.
The following information may help you:
Packages with unmet dependencies:
sqlitebrowser : Depends: libqt5scintilla2-12v5 (>= 2.8.4) but it won't install
E: Unable to fix bugs, you have broken packages held.
Pandora ~ #
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apt-get -f install doesn't help

Answer 1

apt-get install aptitude (if not present)
aptitude install sqlitebrowser