在umount -a之后如何重新挂载快照包

我今天打开了笔记本电脑,侧面板上的几个图标为空白,相应的程序无法打开。

The main suspected reason is those programs were all installed using snap, and because one of the last things I've done was running sudo umount -a to fix a frozen nautilus thanks to a wrongly mounted online drive. And as I vaguely understand, snap works using some mounted 'devices'.

如果确实是它们不起作用的原因:

有什么方法可以重新挂载这些快照程序,而无需重新启动整个系统?

And how would one in the future run the umount -a without this side effect?

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