Same error for me since updating Telegram on Ubuntu 21.10
$ telegram-desktop telegram-desktop: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /var/lib/snapd/lib/gl/libEGL.so.1)
Same error for me since updating Telegram on Ubuntu 21.10
$ telegram-desktop 64-linux- gnu/libc. so.6: version `GLIBC_2.33' not found (required by /var/lib/ snapd/lib/ gl/libEGL. so.1)
telegram-desktop: /lib/x86_