Can't type apostrophe, deadkeys do not work (bionic)

I use Ubuntu 18.04 bionic, and I use us(alt-intl) as a keyboard layout for Latin script, because sometimes I need type multilingual texts. Today I got very strange bug: now I cannot use the sign ' (apostrophe). When I press the key <AC11> assigned to apostrophe, I get nothing. When I press space key after that, I get space. When I press <AC11> + e.g. "a", I get "a", not "á". When I press SHIFT + <AC11>, I also get nothing. So, I can't type " (quotation mark) too.

The website keycode.info tells (pressing <AC11>): 222, event.key Dead, event.location 0 (General keys), event.which(deprecated) 222, event.code Quote

My /usr/share/X11/locale/en_US.UTF-8/Compose has such a rows (nothing abnormal):

# Spacing versions of dead accents
<dead_acute> <space>                    : "'"   apostrophe # APOSTROPHE
<dead_acute> <dead_acute>               : "´"   acute # ACUTE ACCENT
<Multi_key> <apostrophe> <apostrophe>   : "´"   acute # ACUTE ACCENT

In addition, when I use AltGr typing with us(alt-intl), it also doesn't work, but when I type Cyrillic texts with ru(udm), AltGr works normally.

Any advices, please.